diff --git a/cmd/config.go b/cmd/config.go
index b53b252323..9be624c22e 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -81,6 +81,15 @@ func setGenesis(ctx *cli.Context, cfg *config.OntologyConfig) error {
 		cfg.Genesis = config.PolarisConfig
 	}
 
+	if ctx.Bool(utils.GetFlagName(utils.EnableLayer2ModeFlag)) {
+		cfg.Genesis.ConsensusType = config.CONSENSUS_TYPE_SOLO
+		cfg.Genesis.SOLO.GenBlockTime = ctx.Uint(utils.GetFlagName(utils.Layer2ModeGenBlockTimeFlag))
+		if cfg.Genesis.SOLO.GenBlockTime <= 1 {
+			cfg.Genesis.SOLO.GenBlockTime = config.DEFAULT_GEN_BLOCK_TIME
+		}
+		return nil
+	}
+
 	if ctx.Bool(utils.GetFlagName(utils.EnableTestModeFlag)) {
 		cfg.Genesis.ConsensusType = config.CONSENSUS_TYPE_SOLO
 		cfg.Genesis.SOLO.GenBlockTime = ctx.Uint(utils.GetFlagName(utils.TestModeGenBlockTimeFlag))
@@ -135,6 +144,7 @@ func setCommonConfig(ctx *cli.Context, cfg *config.CommonConfig) {
 	cfg.EnableEventLog = !ctx.Bool(utils.GetFlagName(utils.DisableEventLogFlag))
 	cfg.GasLimit = ctx.Uint64(utils.GetFlagName(utils.GasLimitFlag))
 	cfg.GasPrice = ctx.Uint64(utils.GetFlagName(utils.GasPriceFlag))
+	cfg.MinOngLimit = ctx.Uint64(utils.GetFlagName(utils.MinOngLimitFlag))
 	cfg.DataDir = ctx.String(utils.GetFlagName(utils.DataDirFlag))
 }
 
diff --git a/cmd/usage.go b/cmd/usage.go
index 62177473bb..b3b4a54a99 100644
--- a/cmd/usage.go
+++ b/cmd/usage.go
@@ -184,6 +184,13 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.WsPortFlag,
 		},
 	},
+	{
+		Name: "LAYER2 MODE",
+		Flags: []cli.Flag{
+			utils.EnableLayer2ModeFlag,
+			utils.Layer2ModeGenBlockTimeFlag,
+		},
+	},
 	{
 		Name: "TEST MODE",
 		Flags: []cli.Flag{
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 5c90f187d9..bf35935342 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -104,6 +104,23 @@ var (
 		Value: config.DEFAULT_GAS_PRICE,
 	}
 
+	MinOngLimitFlag = cli.Uint64Flag{
+		Name:  "minonglimit",
+		Usage: "Min withdraw and transfer Ong `<value>`.",
+		Value: config.DEFAULT_MIN_ONG_LIMIT,
+	}
+
+	EnableLayer2ModeFlag = cli.BoolFlag{
+		Name:  "layer2mode",
+		Usage: "Single node for layer2. In layer2 mode, will start rpc, rest, web socket server, and set default gasprice to 0",
+	}
+
+	Layer2ModeGenBlockTimeFlag = cli.UintFlag{
+		Name:  "layer2mode-gen-block-time",
+		Usage: "Block-out `<time>`(s) in layer2 mode.",
+		Value: config.DEFAULT_GEN_BLOCK_TIME,
+	}
+
 	//Test Mode setting
 	EnableTestModeFlag = cli.BoolFlag{
 		Name:  "testmode",
diff --git a/cmd/utils/ont.go b/cmd/utils/ont.go
index 2aba7b5b67..2418a910d5 100644
--- a/cmd/utils/ont.go
+++ b/cmd/utils/ont.go
@@ -292,6 +292,7 @@ func NewInvokeTransaction(gasPrice, gasLimit uint64, invokeCode []byte) *types.M
 		GasPrice: gasPrice,
 		GasLimit: gasLimit,
 		TxType:   types.InvokeNeo,
+		SystemId: constants.SYSTEM_ID,
 		Nonce:    rand.Uint32(),
 		Payload:  invokePayload,
 		Sigs:     make([]types.Sig, 0, 0),
@@ -786,6 +787,7 @@ func NewDeployCodeTransaction(gasPrice, gasLimit uint64, code []byte, vmType pay
 	tx := &types.MutableTransaction{
 		Version:  VERSION_TRANSACTION,
 		TxType:   types.Deploy,
+		SystemId: constants.SYSTEM_ID,
 		Nonce:    uint32(time.Now().Unix()),
 		Payload:  deployPayload,
 		GasPrice: gasPrice,
diff --git a/common/config/config.go b/common/config/config.go
index 2d5ad82ee6..17a028006e 100644
--- a/common/config/config.go
+++ b/common/config/config.go
@@ -73,6 +73,7 @@ const (
 	DEFAULT_CLI_RPC_PORT                    = uint(20000)
 	DEFUALT_CLI_RPC_ADDRESS                 = "127.0.0.1"
 	DEFAULT_GAS_LIMIT                       = 20000
+	DEFAULT_MIN_ONG_LIMIT                   = 100000000
 	DEFAULT_GAS_PRICE                       = 500
 	DEFAULT_WASM_GAS_FACTOR                 = uint64(10)
 	DEFAULT_WASM_MAX_STEPCOUNT              = uint64(8000000)
@@ -591,6 +592,7 @@ type CommonConfig struct {
 	SystemFee        map[string]int64
 	GasLimit         uint64
 	GasPrice         uint64
+	MinOngLimit      uint64
 	DataDir          string
 	WasmVerifyMethod VerifyMethod
 }
diff --git a/common/constants/constants.go b/common/constants/constants.go
index 7d1bec4313..06e76f90c7 100644
--- a/common/constants/constants.go
+++ b/common/constants/constants.go
@@ -91,3 +91,5 @@ const BLOCKHEIGHT_ONTFS_MAINNET = 8550000
 const BLOCKHEIGHT_ONTFS_POLARIS = 12250000
 
 const BLOCKHEIGHT_CC_POLARIS = 13130000
+
+const SYSTEM_ID = 1
diff --git a/consensus/solo/solo.go b/consensus/solo/solo.go
index a5f4b61188..c79cd3ffbf 100644
--- a/consensus/solo/solo.go
+++ b/consensus/solo/solo.go
@@ -51,6 +51,8 @@ type SoloService struct {
 	genBlockInterval time.Duration
 	pid              *actor.PID
 	sub              *events.ActorSubscriber
+	counter          int
+	genEmptyBlock    int
 }
 
 func NewSoloService(bkAccount *account.Account, txpool *actor.PID) (*SoloService, error) {
@@ -59,6 +61,8 @@ func NewSoloService(bkAccount *account.Account, txpool *actor.PID) (*SoloService
 		poolActor:        &actorTypes.TxPoolActor{Pool: txpool},
 		incrValidator:    increment.NewIncrementValidator(20),
 		genBlockInterval: time.Duration(config.DefConfig.Genesis.SOLO.GenBlockTime) * time.Second,
+		counter:          0,
+		genEmptyBlock:    0,
 	}
 
 	props := actor.FromProducer(func() actor.Actor {
@@ -146,6 +150,9 @@ func (self *SoloService) genBlock() error {
 	if err != nil {
 		return fmt.Errorf("makeBlock error %s", err)
 	}
+	if block == nil {
+		return nil
+	}
 
 	result, err := ledger.DefLedger.ExecuteBlock(block)
 	if err != nil {
@@ -183,6 +190,11 @@ func (self *SoloService) makeBlock() (*types.Block, error) {
 	}
 	prevHash := ledger.DefLedger.GetCurrentBlockHash()
 	height := ledger.DefLedger.GetCurrentBlockHeight()
+	stateRoot, err := ledger.DefLedger.GetGlobalStateRoot(height)
+	if err != nil {
+		return nil, fmt.Errorf("GetGlobalStateRoot error:%s", err)
+	}
+	log.Debugf("global state root, height: %d, %v", height, stateRoot)
 
 	validHeight := height
 
@@ -198,7 +210,20 @@ func (self *SoloService) makeBlock() (*types.Block, error) {
 	log.Infof("current block height %v, increment validator block cache range: [%d, %d)", height, start, end)
 
 	txs := self.poolActor.GetTxnPool(true, validHeight)
-
+	//
+	if len(txs) == 0 && self.counter < 3600 && self.genEmptyBlock == 0 {
+		self.counter++
+		log.Infof("The number of tx is too small or timer is not out, counter: %d", self.counter)
+		return nil, nil
+	} else if len(txs) > 0 {
+		self.genEmptyBlock = 1
+		self.counter = 0
+	} else if self.genEmptyBlock > 0 {
+		self.genEmptyBlock--
+		self.counter = 0
+	} else {
+		self.counter = 0
+	}
 	transactions := make([]*types.Transaction, 0, len(txs))
 	for _, txEntry := range txs {
 		// TODO optimize to use height in txentry
@@ -219,6 +244,7 @@ func (self *SoloService) makeBlock() (*types.Block, error) {
 		PrevBlockHash:    prevHash,
 		TransactionsRoot: txRoot,
 		BlockRoot:        blockRoot,
+		StateRoot:        stateRoot,
 		Timestamp:        uint32(time.Now().Unix()),
 		Height:           height + 1,
 		ConsensusData:    common.GetNonce(),
diff --git a/core/ledger/ledger.go b/core/ledger/ledger.go
index c8ad80be1b..68d892b8d2 100644
--- a/core/ledger/ledger.go
+++ b/core/ledger/ledger.go
@@ -85,6 +85,10 @@ func (self *Ledger) GetStateMerkleRoot(height uint32) (result common.Uint256, er
 	return self.ldgStore.GetStateMerkleRoot(height)
 }
 
+func (self *Ledger) GetGlobalStateRoot(height uint32) (result common.Uint256, err error) {
+	return self.ldgStore.GetGlobalStateRoot(height)
+}
+
 func (self *Ledger) GetCrossStatesRoot(height uint32) (common.Uint256, error) {
 	return self.ldgStore.GetCrossStatesRoot(height)
 }
@@ -200,6 +204,10 @@ func (self *Ledger) GetCrossStatesProof(height uint32, key []byte) ([]byte, erro
 	return self.ldgStore.GetCrossStatesProof(height, key)
 }
 
+func (self *Ledger) GetStoreProof(key []byte) ([]byte, []byte, uint32, error) {
+	return self.ldgStore.GetStoreProof(key)
+}
+
 func (self *Ledger) Close() error {
 	return self.ldgStore.Close()
 }
diff --git a/core/store/common/data_entry_prefix.go b/core/store/common/data_entry_prefix.go
index 83df298189..057079e08d 100644
--- a/core/store/common/data_entry_prefix.go
+++ b/core/store/common/data_entry_prefix.go
@@ -42,6 +42,7 @@ const (
 	SYS_BLOCK_MERKLE_TREE    DataEntryPrefix = 0x13 // Block merkle tree root key prefix
 	SYS_STATE_MERKLE_TREE    DataEntryPrefix = 0x20 // state merkle tree root key prefix
 	SYS_CROSS_CHAIN_MSG      DataEntryPrefix = 0x22 // state merkle tree root key prefix
+	SYS_GLOBAL_STATE_TREE    DataEntryPrefix = 0x24
 
 	EVENT_NOTIFY DataEntryPrefix = 0x14 //Event notify key prefix
 
diff --git a/core/store/ledgerstore/ledger_store.go b/core/store/ledgerstore/ledger_store.go
index b2838f5812..dff5a0e26c 100644
--- a/core/store/ledgerstore/ledger_store.go
+++ b/core/store/ledgerstore/ledger_store.go
@@ -21,6 +21,7 @@ package ledgerstore
 import (
 	"bytes"
 	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"hash"
@@ -55,11 +56,15 @@ import (
 	sstate "github.com/ontio/ontology/smartcontract/states"
 	"github.com/ontio/ontology/smartcontract/storage"
 	types2 "github.com/ontio/ontology/vm/neovm/types"
+
+	"github.com/tendermint/iavl"
+	tmdb "github.com/tendermint/tm-db"
 )
 
 const (
 	SYSTEM_VERSION          = byte(1)      //Version of ledger store
 	HEADER_INDEX_BATCH_SIZE = uint32(2000) //Bath size of saving header index
+	defaultIAVLCacheSize    = 10000
 )
 
 var (
@@ -68,6 +73,7 @@ var (
 	DBDirBlock          = "block"
 	DBDirState          = "states"
 	MerkleTreeStorePath = "merkle_tree.db"
+	StateTreeDb         = "state_avl"
 )
 
 type PrexecuteParam struct {
@@ -90,6 +96,7 @@ type LedgerStoreImp struct {
 	vbftPeerInfoMap      map[uint32]map[string]uint32     //key:block height,value:peerInfo
 	lock                 sync.RWMutex
 	stateHashCheckHeight uint32
+	stateTree            *iavl.MutableTree
 
 	savingBlockSemaphore       chan bool
 	closing                    bool
@@ -132,6 +139,16 @@ func NewLedgerStore(dataDir string, stateHashHeight uint32) (*LedgerStoreImp, er
 	}
 	ledgerStore.eventStore = eventState
 
+	stateDb, err := tmdb.NewGoLevelDB(StateTreeDb, dataDir)
+	if err != nil {
+		return nil, fmt.Errorf("NewGoLevelDB err %s", err)
+	}
+	stateTree, err := iavl.NewMutableTree(stateDb, defaultIAVLCacheSize)
+	if err != nil {
+		return nil, fmt.Errorf("NewMutableTree err %s", err)
+	}
+	ledgerStore.stateTree = stateTree
+
 	return ledgerStore, nil
 }
 
@@ -309,6 +326,7 @@ func (this *LedgerStoreImp) recoverStore() error {
 	if err != nil {
 		return fmt.Errorf("stateStore.GetCurrentBlock error %s", err)
 	}
+	this.stateTree.LoadVersion(int64(stateHeight + 1))
 	for i := stateHeight; i < blockHeight; i++ {
 		blockHash, err := this.blockStore.GetBlockHash(i)
 		if err != nil {
@@ -324,6 +342,15 @@ func (this *LedgerStoreImp) recoverStore() error {
 		if err != nil {
 			return err
 		}
+		rootHash, version, err := this.stateTree.SaveVersion()
+		if err != nil {
+			return fmt.Errorf("stateTree.SaveVersion height:%d error %s", i, err)
+		}
+		log.Infof("state tree save version, root hash: %s, version: %d", hex.EncodeToString(rootHash), version)
+		result.StateRoot, err = common.Uint256ParseFromBytes(rootHash)
+		if err != nil {
+			return fmt.Errorf("common.Uint256ParseFromBytes height:%d error %s", i, err)
+		}
 		err = this.saveBlockToStateStore(block, result)
 		if err != nil {
 			return fmt.Errorf("save to state store height:%d error:%s", i, err)
@@ -583,6 +610,26 @@ func (this *LedgerStoreImp) GetStateMerkleRoot(height uint32) (common.Uint256, e
 	return this.stateStore.GetStateMerkleRoot(height)
 }
 
+func (this *LedgerStoreImp) GetGlobalStateRoot(height uint32) (common.Uint256, error) {
+	return this.stateStore.GetGlobalStateRoot(height)
+}
+
+func (this *LedgerStoreImp) GetStoreProof(key []byte) ([]byte, []byte, uint32, error) {
+	version := this.stateTree.Version() - 1
+	latestTree, err := this.stateTree.GetImmutable(version)
+	if err != nil {
+		return nil, nil, 0, err
+	}
+	value, proof, err := latestTree.GetWithProof(key)
+	if err != nil {
+		return nil, nil, 0, err
+	}
+	data := common.NewZeroCopySink(nil)
+	storeProof := types.StoreProof(*proof)
+	storeProof.Serialization(data)
+	return value, data.Bytes(), uint32(version), err
+}
+
 func (this *LedgerStoreImp) ExecuteBlock(block *types.Block) (result store.ExecuteResult, err error) {
 	this.getSavingBlockLock()
 	defer this.releaseSavingBlockLock()
@@ -768,7 +815,6 @@ func (this *LedgerStoreImp) executeBlock(block *types.Block) (result store.Execu
 	} else {
 		result.MerkleRoot = this.stateStore.GetStateMerkleRootWithNewHash(result.Hash)
 	}
-
 	return
 }
 
@@ -820,6 +866,11 @@ func (this *LedgerStoreImp) saveBlockToStateStore(block *types.Block, result sto
 		return fmt.Errorf("AddBlockMerkleTreeRoot error %s", err)
 	}
 
+	err = this.stateStore.AddGlobalStateRoot(blockHeight, result.StateRoot)
+	if err != nil {
+		return fmt.Errorf("AddGlobalStateRoot error %s", err)
+	}
+
 	err = this.stateStore.SaveCurrentBlock(blockHeight, blockHash)
 	if err != nil {
 		return fmt.Errorf("SaveCurrentBlock error %s", err)
@@ -929,6 +980,16 @@ func (this *LedgerStoreImp) submitBlock(block *types.Block, crossChainMsg *types
 	if err != nil {
 		return fmt.Errorf("save to msg cross chain store height:%d error:%s", blockHeight, err)
 	}
+	this.updateStateToTree(result.WriteSet)
+	rootHash, version, err := this.stateTree.SaveVersion()
+	if err != nil {
+		return fmt.Errorf("stateTree.SaveVersion height:%d err %s", blockHeight, err)
+	}
+	log.Infof("state tree save version, root hash: %s, version: %d", hex.EncodeToString(rootHash), version)
+	result.StateRoot, err = common.Uint256ParseFromBytes(rootHash)
+	if err != nil {
+		return fmt.Errorf("common.Uint256ParseFromBytes height:%d err %s", blockHeight, err)
+	}
 	err = this.saveBlockToStateStore(block, result)
 	if err != nil {
 		return fmt.Errorf("save to state store height:%d error:%s", blockHeight, err)
@@ -1040,6 +1101,13 @@ func (this *LedgerStoreImp) saveHeaderIndexList() error {
 	return nil
 }
 
+func (this *LedgerStoreImp) updateStateToTree(writeSet *overlaydb.MemDB) {
+	writeSet.ForEach(func(key, val []byte) {
+		this.stateTree.Set(key, val)
+		log.Infof("update state to tree, key: %s", hex.EncodeToString(key))
+	})
+}
+
 //IsContainBlock return whether the block is in store
 func (this *LedgerStoreImp) IsContainBlock(blockHash common.Uint256) (bool, error) {
 	return this.blockStore.ContainBlock(blockHash)
diff --git a/core/store/ledgerstore/state_store.go b/core/store/ledgerstore/state_store.go
index 40fa169d96..17c3ec66cc 100644
--- a/core/store/ledgerstore/state_store.go
+++ b/core/store/ledgerstore/state_store.go
@@ -231,6 +231,30 @@ func (self *StateStore) GetMerkleProof(proofHeight, rootHeight uint32) ([]common
 	return self.merkleTree.InclusionProof(proofHeight, rootHeight+1)
 }
 
+//AddBlockMerkleTreeRoot add a new tree root
+func (self *StateStore) AddGlobalStateRoot(height uint32, stateRoot common.Uint256) error {
+	key := self.genGlobalStateKey(height)
+	value := common.NewZeroCopySink(make([]byte, 0, common.UINT256_SIZE))
+	value.WriteHash(stateRoot)
+	self.store.BatchPut(key, value.Bytes())
+	return nil
+}
+
+func (self *StateStore) GetGlobalStateRoot(height uint32) (result common.Uint256, err error) {
+	key := self.genGlobalStateKey(height)
+	var value []byte
+	value, err = self.store.Get(key)
+	if err != nil {
+		return common.UINT256_EMPTY, err
+	}
+	source := common.NewZeroCopySource(value)
+	result, eof := source.NextHash()
+	if eof {
+		return common.UINT256_EMPTY, io.ErrUnexpectedEOF
+	}
+	return result, nil
+}
+
 func (self *StateStore) NewOverlayDB() *overlaydb.OverlayDB {
 	return overlaydb.NewOverlayDB(self.store)
 }
@@ -443,6 +467,13 @@ func (self *StateStore) genStateMerkleRootKey(height uint32) []byte {
 	return key
 }
 
+func (self *StateStore) genGlobalStateKey(height uint32) []byte {
+	key := make([]byte, 5)
+	key[0] = byte(scom.SYS_GLOBAL_STATE_TREE)
+	binary.LittleEndian.PutUint32(key[1:], height)
+	return key
+}
+
 //ClearAll clear all data in state store
 func (self *StateStore) ClearAll() error {
 	self.store.NewBatch()
diff --git a/core/store/store.go b/core/store/store.go
index 61a128df26..742f4b1845 100644
--- a/core/store/store.go
+++ b/core/store/store.go
@@ -36,6 +36,7 @@ type ExecuteResult struct {
 	CrossStates     []common.Uint256
 	CrossStatesRoot common.Uint256
 	Notify          []*event.ExecuteNotify
+	StateRoot       common.Uint256
 }
 
 // LedgerStore provides func with store package.
@@ -47,6 +48,7 @@ type LedgerStore interface {
 	ExecuteBlock(b *types.Block) (ExecuteResult, error)                                       // called by consensus
 	SubmitBlock(b *types.Block, crossChainMsg *types.CrossChainMsg, exec ExecuteResult) error // called by consensus
 	GetStateMerkleRoot(height uint32) (result common.Uint256, err error)
+	GetGlobalStateRoot(height uint32) (result common.Uint256, err error)
 	GetCurrentBlockHash() common.Uint256
 	GetCurrentBlockHeight() uint32
 	GetCurrentHeaderHeight() uint32
@@ -75,4 +77,6 @@ type LedgerStore interface {
 	GetCrossChainMsg(height uint32) (*types.CrossChainMsg, error)
 	GetCrossStatesProof(height uint32, key []byte) ([]byte, error)
 	EnableBlockPrune(numBeforeCurr uint32)
+
+	GetStoreProof(key []byte) ([]byte, []byte, uint32, error)
 }
diff --git a/core/types/block.go b/core/types/block.go
index 2f3498efa5..226d172d39 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -90,6 +90,57 @@ func (self *Block) Deserialization(source *common.ZeroCopySource) error {
 	return nil
 }
 
+// if no error, ownership of param raw is transfered to Transaction
+func BlockFromRawBytes_ont(raw []byte) (*Block, error) {
+	source := common.NewZeroCopySource(raw)
+	block := &Block{}
+	err := block.Deserialization_ont(source)
+	if err != nil {
+		return nil, err
+	}
+	return block, nil
+}
+
+func (self *Block) Deserialization_ont(source *common.ZeroCopySource) error {
+	if self.Header == nil {
+		self.Header = new(Header)
+	}
+	err := self.Header.Deserialization_ont(source)
+	if err != nil {
+		return err
+	}
+
+	length, eof := source.NextUint32()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+
+	var hashes []common.Uint256
+	mask := make(map[common.Uint256]bool)
+	for i := uint32(0); i < length; i++ {
+		transaction := new(Transaction)
+		// note currently all transaction in the block shared the same source
+		err := transaction.Deserialization_ont(source)
+		if err != nil {
+			return err
+		}
+		txhash := transaction.Hash()
+		if mask[txhash] {
+			return errors.New("duplicated transaction in block")
+		}
+		mask[txhash] = true
+		hashes = append(hashes, txhash)
+		self.Transactions = append(self.Transactions, transaction)
+	}
+
+	root := common.ComputeMerkleRoot(hashes)
+	if self.Header.TransactionsRoot != root {
+		return errors.New("mismatched transaction root")
+	}
+
+	return nil
+}
+
 func (b *Block) ToArray() []byte {
 	sink := common.NewZeroCopySink(nil)
 	b.Serialization(sink)
diff --git a/core/types/header.go b/core/types/header.go
index 3f96880011..801480ae5c 100644
--- a/core/types/header.go
+++ b/core/types/header.go
@@ -87,7 +87,7 @@ func (self *RawHeader) Deserialization(source *common.ZeroCopySource) error {
 
 func (self *RawHeader) deserializationUnsigned(source *common.ZeroCopySource) error {
 	// version + preHash + tx root + block root + timestamp
-	source.Skip(4 + 32*3 + 4)
+	source.Skip(4 + 32*4 + 4)
 	self.Height, _ = source.NextUint32()
 	//ConsensusData    uint64
 	source.Skip(8)
@@ -119,6 +119,7 @@ type Header struct {
 	PrevBlockHash    common.Uint256
 	TransactionsRoot common.Uint256
 	BlockRoot        common.Uint256
+	StateRoot        common.Uint256
 	Timestamp        uint32
 	Height           uint32
 	ConsensusData    uint64
@@ -152,6 +153,7 @@ func (bd *Header) serializationUnsigned(sink *common.ZeroCopySink) {
 	sink.WriteBytes(bd.PrevBlockHash[:])
 	sink.WriteBytes(bd.TransactionsRoot[:])
 	sink.WriteBytes(bd.BlockRoot[:])
+	sink.WriteBytes(bd.StateRoot[:])
 	sink.WriteUint32(bd.Timestamp)
 	sink.WriteUint32(bd.Height)
 	sink.WriteUint64(bd.ConsensusData)
@@ -223,6 +225,81 @@ func (bd *Header) Deserialization(source *common.ZeroCopySource) error {
 func (bd *Header) deserializationUnsigned(source *common.ZeroCopySource) error {
 	var irregular, eof bool
 
+	bd.Version, eof = source.NextUint32()
+	bd.PrevBlockHash, eof = source.NextHash()
+	bd.TransactionsRoot, eof = source.NextHash()
+	bd.BlockRoot, eof = source.NextHash()
+	bd.StateRoot, eof = source.NextHash()
+	bd.Timestamp, eof = source.NextUint32()
+	bd.Height, eof = source.NextUint32()
+	bd.ConsensusData, eof = source.NextUint64()
+
+	bd.ConsensusPayload, _, irregular, eof = source.NextVarBytes()
+	if irregular {
+		return common.ErrIrregularData
+	}
+
+	bd.NextBookkeeper, eof = source.NextAddress()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+
+func (bd *Header) Deserialization_ont(source *common.ZeroCopySource) error {
+	err := bd.deserializationUnsigned_ont(source)
+	if err != nil {
+		return err
+	}
+
+	n, _, irregular, eof := source.NextVarUint()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	if irregular {
+		return common.ErrIrregularData
+	}
+
+	for i := 0; i < int(n); i++ {
+		buf, _, irregular, eof := source.NextVarBytes()
+		if eof {
+			return io.ErrUnexpectedEOF
+		}
+		if irregular {
+			return common.ErrIrregularData
+		}
+		pubkey, err := keypair.DeserializePublicKey(buf)
+		if err != nil {
+			return err
+		}
+		bd.Bookkeepers = append(bd.Bookkeepers, pubkey)
+	}
+
+	m, _, irregular, eof := source.NextVarUint()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	if irregular {
+		return common.ErrIrregularData
+	}
+
+	for i := 0; i < int(m); i++ {
+		sig, _, irregular, eof := source.NextVarBytes()
+		if eof {
+			return io.ErrUnexpectedEOF
+		}
+		if irregular {
+			return common.ErrIrregularData
+		}
+		bd.SigData = append(bd.SigData, sig)
+	}
+
+	return nil
+}
+
+func (bd *Header) deserializationUnsigned_ont(source *common.ZeroCopySource) error {
+	var irregular, eof bool
+
 	bd.Version, eof = source.NextUint32()
 	bd.PrevBlockHash, eof = source.NextHash()
 	bd.TransactionsRoot, eof = source.NextHash()
diff --git a/core/types/mutable_transaction.go b/core/types/mutable_transaction.go
index 3f896def5b..708bfccbc8 100644
--- a/core/types/mutable_transaction.go
+++ b/core/types/mutable_transaction.go
@@ -28,6 +28,7 @@ import (
 type MutableTransaction struct {
 	Version  byte
 	TxType   TransactionType
+	SystemId uint32
 	Nonce    uint32
 	GasPrice uint64
 	GasLimit uint64
@@ -49,6 +50,16 @@ func (self *MutableTransaction) IntoImmutable() (*Transaction, error) {
 	return TransactionFromRawBytes(sink.Bytes())
 }
 
+func (self *MutableTransaction) IntoImmutable_ont() (*Transaction, error) {
+	sink := common.NewZeroCopySink(nil)
+	err := self.serialize_ont(sink)
+	if err != nil {
+		return nil, err
+	}
+
+	return TransactionFromRawBytes_ont(sink.Bytes())
+}
+
 func (self *MutableTransaction) Hash() common.Uint256 {
 	tx, err := self.IntoImmutable()
 	if err != nil {
@@ -57,6 +68,14 @@ func (self *MutableTransaction) Hash() common.Uint256 {
 	return tx.Hash()
 }
 
+func (self *MutableTransaction) Hash_ont() common.Uint256 {
+	tx, err := self.IntoImmutable_ont()
+	if err != nil {
+		return common.UINT256_EMPTY
+	}
+	return tx.Hash()
+}
+
 func (self *MutableTransaction) GetSignatureAddresses() []common.Address {
 	address := make([]common.Address, 0, len(self.Sigs))
 	for _, sig := range self.Sigs {
@@ -94,9 +113,52 @@ func (tx *MutableTransaction) serialize(sink *common.ZeroCopySink) error {
 	return nil
 }
 
+func (tx *MutableTransaction) serialize_ont(sink *common.ZeroCopySink) error {
+	err := tx.serializeUnsigned_ont(sink)
+	if err != nil {
+		return err
+	}
+
+	sink.WriteVarUint(uint64(len(tx.Sigs)))
+	for _, sig := range tx.Sigs {
+		err = sig.Serialization(sink)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (tx *MutableTransaction) serializeUnsigned_ont(sink *common.ZeroCopySink) error {
+	sink.WriteByte(byte(tx.Version))
+	sink.WriteByte(byte(tx.TxType))
+	sink.WriteUint32(tx.Nonce)
+	sink.WriteUint64(tx.GasPrice)
+	sink.WriteUint64(tx.GasLimit)
+	sink.WriteBytes(tx.Payer[:])
+
+	//Payload
+	if tx.Payload == nil {
+		return errors.New("transaction payload is nil")
+	}
+	switch pl := tx.Payload.(type) {
+	case *payload.DeployCode:
+		pl.Serialization(sink)
+	case *payload.InvokeCode:
+		pl.Serialization(sink)
+	default:
+		return errors.New("wrong transaction payload type")
+	}
+	sink.WriteVarUint(uint64(tx.attributes))
+
+	return nil
+}
+
 func (tx *MutableTransaction) serializeUnsigned(sink *common.ZeroCopySink) error {
 	sink.WriteByte(byte(tx.Version))
 	sink.WriteByte(byte(tx.TxType))
+	sink.WriteUint32(tx.SystemId)
 	sink.WriteUint32(tx.Nonce)
 	sink.WriteUint64(tx.GasPrice)
 	sink.WriteUint64(tx.GasLimit)
diff --git a/core/types/store_proof.go b/core/types/store_proof.go
new file mode 100644
index 0000000000..2e202ca6a0
--- /dev/null
+++ b/core/types/store_proof.go
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2018 The ontology Authors
+ * This file is part of The ontology library.
+ *
+ * The ontology is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The ontology is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with The ontology.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package types
+
+import (
+	"io"
+
+	"github.com/ontio/ontology/common"
+	"github.com/tendermint/iavl"
+)
+
+type StoreProof iavl.RangeProof
+
+func (this *StoreProof) Serialization(sink *common.ZeroCopySink) {
+	sink.WriteUint32(uint32(len(this.LeftPath)))
+	for _, item := range this.LeftPath {
+		sink.WriteUint8(uint8(item.Height))
+		sink.WriteInt64(item.Size)
+		sink.WriteInt64(item.Version)
+		sink.WriteVarBytes(item.Left)
+		sink.WriteVarBytes(item.Right)
+	}
+	sink.WriteUint32(uint32(len(this.InnerNodes)))
+	for _, item := range this.InnerNodes {
+		sink.WriteUint32(uint32(len(item)))
+		for _, item1 := range item {
+			sink.WriteUint8(uint8(item1.Height))
+			sink.WriteInt64(item1.Size)
+			sink.WriteInt64(item1.Version)
+			sink.WriteVarBytes(item1.Left)
+			sink.WriteVarBytes(item1.Right)
+		}
+	}
+	sink.WriteUint32(uint32(len(this.Leaves)))
+	for _, item := range this.Leaves {
+		sink.WriteVarBytes(item.Key)
+		sink.WriteVarBytes(item.ValueHash)
+		sink.WriteInt64(item.Version)
+	}
+}
+
+func (this *StoreProof) Deserialization(source *common.ZeroCopySource) error {
+	leftPathLen, _ := source.NextUint32()
+	this.LeftPath = make([]iavl.ProofInnerNode, leftPathLen)
+	var eof bool
+	var err error
+	for i := 0; i < int(leftPathLen); i++ {
+		height, eof := source.NextUint8()
+		this.LeftPath[i].Height = int8(height)
+		this.LeftPath[i].Size, eof = source.NextInt64()
+		this.LeftPath[i].Version, eof = source.NextInt64()
+		if eof {
+			return io.ErrUnexpectedEOF
+		}
+		this.LeftPath[i].Left, err = source.ReadVarBytes()
+		if err != nil {
+			return io.ErrUnexpectedEOF
+		}
+		this.LeftPath[i].Right, err = source.ReadVarBytes()
+		if err != nil {
+			return io.ErrUnexpectedEOF
+		}
+	}
+	innerNodesLen, eof := source.NextUint32()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	this.InnerNodes = make([]iavl.PathToLeaf, innerNodesLen)
+	for i, _ := range this.InnerNodes {
+		pathToLeafLen, eof := source.NextUint32()
+		if eof {
+			return io.ErrUnexpectedEOF
+		}
+		this.InnerNodes[i] = make([]iavl.ProofInnerNode, pathToLeafLen)
+		for j := 0; j < int(pathToLeafLen); j++ {
+			height, eof := source.NextUint8()
+			this.InnerNodes[i][j].Height = int8(height)
+			this.InnerNodes[i][j].Size, eof = source.NextInt64()
+			this.InnerNodes[i][j].Version, eof = source.NextInt64()
+			if eof {
+				return io.ErrUnexpectedEOF
+			}
+			this.InnerNodes[i][j].Left, err = source.ReadVarBytes()
+			if err != nil {
+				return io.ErrUnexpectedEOF
+			}
+			this.InnerNodes[i][j].Right, err = source.ReadVarBytes()
+			if err != nil {
+				return io.ErrUnexpectedEOF
+			}
+		}
+	}
+	leavesLen, eof := source.NextUint32()
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	this.Leaves = make([]iavl.ProofLeafNode, leavesLen)
+	for i := 0; i < int(leavesLen); i++ {
+		this.Leaves[i].Key, err = source.ReadVarBytes()
+		if err != nil {
+			return io.ErrUnexpectedEOF
+		}
+		this.Leaves[i].ValueHash, err = source.ReadVarBytes()
+		if err != nil {
+			return io.ErrUnexpectedEOF
+		}
+		this.Leaves[i].Version, eof = source.NextInt64()
+	}
+	return nil
+}
diff --git a/core/types/transaction.go b/core/types/transaction.go
index d1aa28ddaf..d8bd9e0b02 100644
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@@ -36,6 +36,7 @@ const MAX_TX_SIZE = 1024 * 1024 // The max size of a transaction to prevent DOS
 type Transaction struct {
 	Version  byte
 	TxType   TransactionType
+	SystemId uint32
 	Nonce    uint32
 	GasPrice uint64
 	GasLimit uint64
@@ -67,6 +68,67 @@ func TransactionFromRawBytes(raw []byte) (*Transaction, error) {
 	return tx, nil
 }
 
+func TransactionFromRawBytes_ont(raw []byte) (*Transaction, error) {
+	if len(raw) > MAX_TX_SIZE {
+		return nil, errors.New("execced max transaction size")
+	}
+	source := common.NewZeroCopySource(raw)
+	tx := &Transaction{Raw: raw}
+	err := tx.Deserialization_ont(source)
+	if err != nil {
+		return nil, err
+	}
+	return tx, nil
+}
+
+func (tx *Transaction) Deserialization_ont(source *common.ZeroCopySource) error {
+	pstart := source.Pos()
+	err := tx.deserializationUnsigned_ont(source)
+	if err != nil {
+		return err
+	}
+	pos := source.Pos()
+	lenUnsigned := pos - pstart
+	source.BackUp(lenUnsigned)
+	rawUnsigned, _ := source.NextBytes(lenUnsigned)
+	temp := sha256.Sum256(rawUnsigned)
+	tx.hash = common.Uint256(sha256.Sum256(temp[:]))
+
+	// tx sigs
+	length, _, irregular, eof := source.NextVarUint()
+	if irregular {
+		return common.ErrIrregularData
+	}
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	if length > constants.TX_MAX_SIG_SIZE {
+		return fmt.Errorf("transaction signature number %d execced %d", length, constants.TX_MAX_SIG_SIZE)
+	}
+
+	for i := 0; i < int(length); i++ {
+		var sig RawSig
+		err := sig.Deserialization(source)
+		if err != nil {
+			return err
+		}
+
+		tx.Sigs = append(tx.Sigs, sig)
+	}
+
+	pend := source.Pos()
+	lenAll := pend - pstart
+	if lenAll > MAX_TX_SIZE {
+		return fmt.Errorf("execced max transaction size:%d", lenAll)
+	}
+	source.BackUp(lenAll)
+	tx.Raw, _ = source.NextBytes(lenAll)
+
+	tx.nonDirectConstracted = true
+
+	return nil
+}
+
 // Transaction has internal reference of param `source`
 func (tx *Transaction) Deserialization(source *common.ZeroCopySource) error {
 	pstart := source.Pos()
@@ -121,6 +183,7 @@ func (tx *Transaction) IntoMutable() (*MutableTransaction, error) {
 	mutable := &MutableTransaction{
 		Version:  tx.Version,
 		TxType:   tx.TxType,
+		SystemId: tx.SystemId,
 		Nonce:    tx.Nonce,
 		GasPrice: tx.GasPrice,
 		GasLimit: tx.GasLimit,
@@ -139,12 +202,65 @@ func (tx *Transaction) IntoMutable() (*MutableTransaction, error) {
 	return mutable, nil
 }
 
+func (tx *Transaction) deserializationUnsigned_ont(source *common.ZeroCopySource) error {
+	var irregular, eof bool
+	tx.Version, eof = source.NextByte()
+	var txtype byte
+	txtype, eof = source.NextByte()
+	tx.TxType = TransactionType(txtype)
+	tx.Nonce, eof = source.NextUint32()
+	tx.GasPrice, eof = source.NextUint64()
+	tx.GasLimit, eof = source.NextUint64()
+	var buf []byte
+	buf, eof = source.NextBytes(common.ADDR_LEN)
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+	copy(tx.Payer[:], buf)
+
+	switch tx.TxType {
+	case InvokeNeo, InvokeWasm:
+		pl := new(payload.InvokeCode)
+		err := pl.Deserialization(source)
+		if err != nil {
+			return err
+		}
+		tx.Payload = pl
+	case Deploy:
+		pl := new(payload.DeployCode)
+		err := pl.Deserialization(source)
+		if err != nil {
+			return err
+		}
+		tx.Payload = pl
+	default:
+		return fmt.Errorf("unsupported tx type %v", tx.TxType)
+	}
+
+	var length uint64
+	length, _, irregular, eof = source.NextVarUint()
+	if irregular {
+		return common.ErrIrregularData
+	}
+	if eof {
+		return io.ErrUnexpectedEOF
+	}
+
+	if length != 0 {
+		return fmt.Errorf("transaction attribute must be 0, got %d", length)
+	}
+	tx.attributes = 0
+
+	return nil
+}
+
 func (tx *Transaction) deserializationUnsigned(source *common.ZeroCopySource) error {
 	var irregular, eof bool
 	tx.Version, eof = source.NextByte()
 	var txtype byte
 	txtype, eof = source.NextByte()
 	tx.TxType = TransactionType(txtype)
+	tx.SystemId, eof = source.NextUint32()
 	tx.Nonce, eof = source.NextUint32()
 	tx.GasPrice, eof = source.NextUint64()
 	tx.GasLimit, eof = source.NextUint64()
diff --git a/core/utils/transaction_builder.go b/core/utils/transaction_builder.go
index 8a723fb2ff..c69cd726b8 100644
--- a/core/utils/transaction_builder.go
+++ b/core/utils/transaction_builder.go
@@ -27,6 +27,7 @@ import (
 	"time"
 
 	"github.com/ontio/ontology/common"
+	"github.com/ontio/ontology/common/constants"
 	"github.com/ontio/ontology/core/payload"
 	"github.com/ontio/ontology/core/types"
 	"github.com/ontio/ontology/smartcontract/states"
@@ -43,8 +44,9 @@ func NewDeployTransaction(code []byte, name, version, author, email, desp string
 		return nil, err
 	}
 	return &types.MutableTransaction{
-		TxType:  types.Deploy,
-		Payload: depCode,
+		TxType:   types.Deploy,
+		SystemId: constants.SYSTEM_ID,
+		Payload:  depCode,
 	}, nil
 }
 
@@ -56,8 +58,9 @@ func NewInvokeTransaction(code []byte) *types.MutableTransaction {
 	}
 
 	return &types.MutableTransaction{
-		TxType:  types.InvokeNeo,
-		Payload: invokeCodePayload,
+		TxType:   types.InvokeNeo,
+		SystemId: constants.SYSTEM_ID,
+		Payload:  invokeCodePayload,
 	}
 }
 
diff --git a/go.mod b/go.mod
index 07b455ec29..ed8d43022d 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ go 1.12
 
 require (
 	github.com/JohnCGriffin/overflow v0.0.0-20170615021017-4d914c927216
-	github.com/Workiva/go-datastructures v1.0.50 // indirect
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/emirpasic/gods v1.12.0 // indirect
 	github.com/ethereum/go-ethereum v1.9.13
@@ -21,10 +20,12 @@ require (
 	github.com/ontio/wagon v0.4.1
 	github.com/orcaman/concurrent-map v0.0.0-20190826125027-8c72a8bb44f6 // indirect
 	github.com/pborman/uuid v1.2.0
-	github.com/prometheus/client_golang v0.9.1
+	github.com/prometheus/client_golang v1.5.0
 	github.com/scylladb/go-set v1.0.2
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
 	github.com/syndtr/goleveldb v1.0.1-0.20190923125748-758128399b1d
+	github.com/tendermint/iavl v0.13.2
+	github.com/tendermint/tm-db v0.5.0
 	github.com/urfave/cli v1.22.1
 	github.com/valyala/bytebufferpool v1.0.0
 	golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4
diff --git a/go.sum b/go.sum
index 0e9c55686c..d68b29cf3b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4=
 github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc=
 github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
@@ -12,41 +14,88 @@ github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN
 github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
 github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/ChainSafe/go-schnorrkel v0.0.0-20200102211924-4bcbc698314f/go.mod h1:URdX5+vg25ts3aCh8H5IFZybJYKWhJHYMTnf+ULtoC4=
 github.com/JohnCGriffin/overflow v0.0.0-20170615021017-4d914c927216 h1:2ZboyJ8vl75fGesnG9NpMTD2DyQI3FzMXy4x752rGF0=
 github.com/JohnCGriffin/overflow v0.0.0-20170615021017-4d914c927216/go.mod h1:X0CRv0ky0k6m906ixxpzmDRLvX58TFUKS2eePweuyxk=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/OneOfOne/xxhash v1.2.5/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/VictoriaMetrics/fastcache v1.5.3/go.mod h1:+jv9Ckb+za/P1ZRg/sulP5Ni1v49daAVERr0H3CuscE=
+github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/Workiva/go-datastructures v1.0.50 h1:slDmfW6KCHcC7U+LP3DDBbm4fqTwZGn1beOFPfGaLvo=
 github.com/Workiva/go-datastructures v1.0.50/go.mod h1:Z+F2Rca0qCsVYDS8z7bAGm8f3UkzuWYS/oBZz5a7VVA=
+github.com/Workiva/go-datastructures v1.0.52 h1:PLSK6pwn8mYdaoaCZEMsXBpBotr4HHn9abU0yMQt0NI=
+github.com/Workiva/go-datastructures v1.0.52/go.mod h1:Z+F2Rca0qCsVYDS8z7bAGm8f3UkzuWYS/oBZz5a7VVA=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce/go.mod h1:5AcXVHNjg+BDxry382+8OKon8SEWiKktQR07RKPsv1c=
 gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200316214253-d7b0ff38cac9/go.mod h1:uAJfkITjFhyEEuUfm7bsmCZRbW5WRq8s9EY8HZ6hCns=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/http/base/actor/ledger.go b/http/base/actor/ledger.go
index b317667cc6..bda110c493 100644
--- a/http/base/actor/ledger.go
+++ b/http/base/actor/ledger.go
@@ -115,3 +115,7 @@ func GetCrossChainMsg(height uint32) (*types.CrossChainMsg, error) {
 func GetCrossStatesProof(height uint32, key []byte) ([]byte, error) {
 	return ledger.DefLedger.GetCrossStatesProof(height, key)
 }
+
+func GetStoreProof(key []byte) ([]byte, []byte, uint32, error) {
+	return ledger.DefLedger.GetStoreProof(key)
+}
diff --git a/http/base/common/common.go b/http/base/common/common.go
index cc9683d8ff..d030efd26f 100644
--- a/http/base/common/common.go
+++ b/http/base/common/common.go
@@ -114,6 +114,13 @@ type CrossStatesProof struct {
 	AuditPath string
 }
 
+type StoreProof struct {
+	Type   string
+	Value  string
+	Proof  string
+	Height uint32
+}
+
 type Transactions struct {
 	Version    byte
 	Nonce      uint32
@@ -491,6 +498,7 @@ func NewSmartContractTransaction(gasPrice, gasLimit uint64, invokeCode []byte) (
 		GasPrice: gasPrice,
 		GasLimit: gasLimit,
 		TxType:   types.InvokeNeo,
+		SystemId: constants.SYSTEM_ID,
 		Nonce:    uint32(time.Now().Unix()),
 		Payload:  invokePayload,
 		Sigs:     nil,
diff --git a/http/base/rpc/interfaces.go b/http/base/rpc/interfaces.go
index 1ab41efec4..dcc560f665 100644
--- a/http/base/rpc/interfaces.go
+++ b/http/base/rpc/interfaces.go
@@ -647,3 +647,23 @@ func GetCrossStatesProof(params []interface{}) map[string]interface{} {
 	}
 	return responseSuccess(bcomn.CrossStatesProof{"CrossStatesProof", hex.EncodeToString(proof)})
 }
+
+func GetStoreProof(params []interface{}) map[string]interface{} {
+	if len(params) < 1 {
+		return responsePack(berr.INVALID_PARAMS, nil)
+	}
+	str, ok := params[0].(string)
+	if !ok {
+		return responsePack(berr.INVALID_PARAMS, "")
+	}
+	key, err := hex.DecodeString(str)
+	if err != nil {
+		return responsePack(berr.INVALID_PARAMS, "")
+	}
+	value, proof, height, err := bactor.GetStoreProof(key)
+	if err != nil {
+		log.Errorf("GetStoreProof, bactor.GetStoreProof error:%s", err)
+		return responsePack(berr.INTERNAL_ERROR, "")
+	}
+	return responseSuccess(bcomn.StoreProof{"StoreProof", hex.EncodeToString(value), hex.EncodeToString(proof), height})
+}
diff --git a/http/jsonrpc/rpc_server.go b/http/jsonrpc/rpc_server.go
index be207087fb..38b69b2663 100644
--- a/http/jsonrpc/rpc_server.go
+++ b/http/jsonrpc/rpc_server.go
@@ -64,6 +64,8 @@ func StartRPCServer() error {
 	rpc.HandleFunc("getcrosschainmsg", rpc.GetCrossChainMsg)
 	rpc.HandleFunc("getcrossstatesproof", rpc.GetCrossStatesProof)
 
+	rpc.HandleFunc("getstoreproof", rpc.GetStoreProof)
+
 	err := http.ListenAndServe(":"+strconv.Itoa(int(cfg.DefConfig.Rpc.HttpJsonPort)), nil)
 	if err != nil {
 		return fmt.Errorf("ListenAndServe error:%s", err)
diff --git a/http/test/func_test.go b/http/test/func_test.go
index fe33657c13..1de6a770ee 100644
--- a/http/test/func_test.go
+++ b/http/test/func_test.go
@@ -77,7 +77,7 @@ func TestMerkleVerifier(t *testing.T) {
 
 func TestTxDeserialize(t *testing.T) {
 	bys, _ := common.HexToBytes("00d1af758596f401000000000000204e000000000000b09ba6a4fe99eb2b2dc1d86a6d453423a6be03f02e0101011552c1126765744469736b506c61796572734c697374676a6f1082c6cec3a1bcbb5a3892cf770061e4b98200014241015d434467639fd8e7b4331d2f3fc0d4168e2d68a203593c6399f5746d2324217aeeb3db8ff31ba0fdb1b13aa6f4c3cd25f7b3d0d26c144bbd75e2963d0a443629232103fdcae8110c9a60d1fc47f8111a12c1941e1f3584b0b0028157736ed1eecd101eac")
-	_, err := types.TransactionFromRawBytes(bys)
+	_, err := types.TransactionFromRawBytes_ont(bys)
 	assert.Nil(t, err)
 }
 func TestAddress(t *testing.T) {
diff --git a/main.go b/main.go
index e299434d6b..1d1f3deb4e 100644
--- a/main.go
+++ b/main.go
@@ -100,6 +100,7 @@ func setupAPP() *cli.App {
 		//txpool setting
 		utils.GasPriceFlag,
 		utils.GasLimitFlag,
+		utils.MinOngLimitFlag,
 		utils.TxpoolPreExecDisableFlag,
 		utils.DisableSyncVerifyTxFlag,
 		utils.DisableBroadcastNetTxFlag,
@@ -112,6 +113,9 @@ func setupAPP() *cli.App {
 		utils.MaxConnInBoundFlag,
 		utils.MaxConnOutBoundFlag,
 		utils.MaxConnInBoundForSingleIPFlag,
+		//layer2 mode
+		utils.EnableLayer2ModeFlag,
+		utils.Layer2ModeGenBlockTimeFlag,
 		//test mode setting
 		utils.EnableTestModeFlag,
 		utils.TestModeGenBlockTimeFlag,
diff --git a/p2pserver/link/link_test.go b/p2pserver/link/link_test.go
index 2f2fb6b003..6f7077e5f4 100644
--- a/p2pserver/link/link_test.go
+++ b/p2pserver/link/link_test.go
@@ -91,7 +91,7 @@ func TestUnpackBufNode(t *testing.T) {
 	case "tx":
 		trn := &mt.Trn{}
 		rawTXBytes, _ := comm.HexToBytes("00d1af758596f401000000000000204e000000000000b09ba6a4fe99eb2b2dc1d86a6d453423a6be03f02e0101011552c1126765744469736b506c61796572734c697374676a6f1082c6cec3a1bcbb5a3892cf770061e4b98200014241015d434467639fd8e7b4331d2f3fc0d4168e2d68a203593c6399f5746d2324217aeeb3db8ff31ba0fdb1b13aa6f4c3cd25f7b3d0d26c144bbd75e2963d0a443629232103fdcae8110c9a60d1fc47f8111a12c1941e1f3584b0b0028157736ed1eecd101eac")
-		tx, _ := ct.TransactionFromRawBytes(rawTXBytes)
+		tx, _ := ct.TransactionFromRawBytes_ont(rawTXBytes)
 		trn.Txn = tx
 		msg = trn
 	case "block":
@@ -105,7 +105,7 @@ func TestUnpackBufNode(t *testing.T) {
 		blk.Header = &header
 
 		rawTXBytes, _ := comm.HexToBytes("00d1af758596f401000000000000204e000000000000b09ba6a4fe99eb2b2dc1d86a6d453423a6be03f02e0101011552c1126765744469736b506c61796572734c697374676a6f1082c6cec3a1bcbb5a3892cf770061e4b98200014241015d434467639fd8e7b4331d2f3fc0d4168e2d68a203593c6399f5746d2324217aeeb3db8ff31ba0fdb1b13aa6f4c3cd25f7b3d0d26c144bbd75e2963d0a443629232103fdcae8110c9a60d1fc47f8111a12c1941e1f3584b0b0028157736ed1eecd101eac")
-		tx, _ := ct.TransactionFromRawBytes(rawTXBytes)
+		tx, _ := ct.TransactionFromRawBytes_ont(rawTXBytes)
 		txs = append(txs, tx)
 
 		blk.Transactions = txs
diff --git a/smartcontract/service/native/native_service.go b/smartcontract/service/native/native_service.go
index 9b10226c3d..dae67fb112 100644
--- a/smartcontract/service/native/native_service.go
+++ b/smartcontract/service/native/native_service.go
@@ -19,8 +19,12 @@
 package native
 
 import (
+	"encoding/hex"
 	"fmt"
 
+	"github.com/ontio/ontology-crypto/keypair"
+	"github.com/ontio/ontology/common/config"
+
 	"github.com/ontio/ontology/common"
 	"github.com/ontio/ontology/core/store"
 	"github.com/ontio/ontology/core/types"
@@ -54,10 +58,12 @@ type NativeService struct {
 	Tx            *types.Transaction
 	Height        uint32
 	Time          uint32
+	MinOngLimit   uint64
 	BlockHash     common.Uint256
 	ContextRef    context.ContextRef
 	PreExec       bool
 	CrossHashes   []common.Uint256
+	Operator      bool
 }
 
 func (this *NativeService) Register(methodName string, handler Handler) {
@@ -70,6 +76,21 @@ func (this *NativeService) Invoke() ([]byte, error) {
 	if !ok {
 		return BYTE_FALSE, fmt.Errorf("Native contract address %x haven't been registered.", contract.Address)
 	}
+	if config.DefConfig.Genesis.ConsensusType == config.CONSENSUS_TYPE_SOLO {
+		operatorPublicKeyBytes, _ := hex.DecodeString(config.DefConfig.Genesis.SOLO.Bookkeepers[0])
+		operatorPublicKey, _ := keypair.DeserializePublicKey(operatorPublicKeyBytes)
+		operatorAddress := types.AddressFromPubKey(operatorPublicKey)
+		player := this.Tx.Payer.ToBase58()
+		if player == operatorAddress.ToBase58() {
+			this.Operator = true
+		} else {
+			this.Operator = false
+		}
+		this.MinOngLimit = config.DefConfig.Common.MinOngLimit
+	} else {
+		this.Operator = false
+		this.MinOngLimit = 1
+	}
 	services(this)
 	service, ok := this.ServiceMap[contract.Method]
 	if !ok {
diff --git a/smartcontract/service/native/ong/ong.go b/smartcontract/service/native/ong/ong.go
index 4daef89468..8ac3e42326 100644
--- a/smartcontract/service/native/ong/ong.go
+++ b/smartcontract/service/native/ong/ong.go
@@ -74,8 +74,8 @@ func OngTransfer(native *native.NativeService) ([]byte, error) {
 	}
 	contract := native.ContextRef.CurrentContext().ContractAddress
 	for _, v := range transfers.States {
-		if v.Value == 0 {
-			continue
+		if v.Value < native.MinOngLimit {
+			return utils.BYTE_FALSE, fmt.Errorf("transfer ong amount:%d is too small!", v.Value)
 		}
 		if v.Value > constants.ONG_TOTAL_SUPPLY {
 			return utils.BYTE_FALSE, fmt.Errorf("transfer ong amount:%d over totalSupply:%d", v.Value, constants.ONG_TOTAL_SUPPLY)
@@ -111,8 +111,8 @@ func OngTransferFrom(native *native.NativeService) ([]byte, error) {
 	if err := state.Deserialization(source); err != nil {
 		return utils.BYTE_FALSE, errors.NewDetailErr(err, errors.ErrNoCode, "[OntTransferFrom] State deserialize error!")
 	}
-	if state.Value == 0 {
-		return utils.BYTE_FALSE, nil
+	if state.Value < native.MinOngLimit {
+		return utils.BYTE_FALSE, fmt.Errorf("transfer ong amount:%d is too small!", state.Value)
 	}
 	if state.Value > constants.ONG_TOTAL_SUPPLY {
 		return utils.BYTE_FALSE, fmt.Errorf("approve ong amount:%d over totalSupply:%d", state.Value, constants.ONG_TOTAL_SUPPLY)
diff --git a/smartcontract/service/native/ont/utils.go b/smartcontract/service/native/ont/utils.go
index bd299fba00..2d808f92bc 100644
--- a/smartcontract/service/native/ont/utils.go
+++ b/smartcontract/service/native/ont/utils.go
@@ -73,18 +73,35 @@ func GenBalanceKey(contract, addr common.Address) []byte {
 }
 
 func Transfer(native *native.NativeService, contract common.Address, state *State) (uint64, uint64, error) {
-	if !native.ContextRef.CheckWitness(state.From) {
-		return 0, 0, errors.NewErr("authentication failed!")
+	// this is layer2 tx
+	isLayer2Deposit := IsLayer2Addr(state.From)
+	if isLayer2Deposit {
+		if native.Operator == false {
+			return 0, 0, errors.NewErr("only operator can use layer2 deposit!")
+		}
+	} else {
+		if !native.ContextRef.CheckWitness(state.From) {
+			return 0, 0, errors.NewErr("authentication failed!")
+		}
 	}
 
-	fromBalance, err := fromTransfer(native, GenBalanceKey(contract, state.From), state.Value)
-	if err != nil {
-		return 0, 0, err
+	//
+	isLayer2Withdraw := IsLayer2Addr(state.To)
+	fromBalance := uint64(0)
+	toBalance := uint64(0)
+	var err error
+	if isLayer2Deposit != true {
+		fromBalance, err = fromTransfer(native, GenBalanceKey(contract, state.From), state.Value)
+		if err != nil {
+			return 0, 0, err
+		}
 	}
 
-	toBalance, err := toTransfer(native, GenBalanceKey(contract, state.To), state.Value)
-	if err != nil {
-		return 0, 0, err
+	if isLayer2Withdraw != true {
+		toBalance, err = toTransfer(native, GenBalanceKey(contract, state.To), state.Value)
+		if err != nil {
+			return 0, 0, err
+		}
 	}
 	return fromBalance, toBalance, nil
 }
@@ -95,28 +112,44 @@ func GenApproveKey(contract, from, to common.Address) []byte {
 }
 
 func TransferedFrom(native *native.NativeService, currentContract common.Address, state *TransferFrom) (uint64, uint64, error) {
-	if native.Time <= config.GetOntHolderUnboundDeadline()+constants.GENESIS_BLOCK_TIMESTAMP {
-		if !native.ContextRef.CheckWitness(state.Sender) {
-			return 0, 0, errors.NewErr("authentication failed!")
+	isLayer2Deposit := IsLayer2Addr(state.From)
+	if isLayer2Deposit {
+		if native.Operator == false {
+			return 0, 0, errors.NewErr("only operator can use layer2 deposit!")
 		}
 	} else {
-		if state.Sender != state.To && !native.ContextRef.CheckWitness(state.Sender) {
-			return 0, 0, errors.NewErr("authentication failed!")
+		if native.Time <= config.GetOntHolderUnboundDeadline()+constants.GENESIS_BLOCK_TIMESTAMP {
+			if !native.ContextRef.CheckWitness(state.Sender) {
+				return 0, 0, errors.NewErr("authentication failed!")
+			}
+		} else {
+			if state.Sender != state.To && !native.ContextRef.CheckWitness(state.Sender) {
+				return 0, 0, errors.NewErr("authentication failed!")
+			}
 		}
 	}
 
-	if err := fromApprove(native, genTransferFromKey(currentContract, state), state.Value); err != nil {
-		return 0, 0, err
-	}
+	isLayer2Withdraw := IsLayer2Addr(state.To)
 
-	fromBalance, err := fromTransfer(native, GenBalanceKey(currentContract, state.From), state.Value)
-	if err != nil {
-		return 0, 0, err
+	var fromBalance uint64
+	var toBalance uint64
+	var err error
+	if !isLayer2Deposit {
+		if err := fromApprove(native, genTransferFromKey(currentContract, state), state.Value); err != nil {
+			return 0, 0, err
+		}
+
+		fromBalance, err = fromTransfer(native, GenBalanceKey(currentContract, state.From), state.Value)
+		if err != nil {
+			return 0, 0, err
+		}
 	}
 
-	toBalance, err := toTransfer(native, GenBalanceKey(currentContract, state.To), state.Value)
-	if err != nil {
-		return 0, 0, err
+	if !isLayer2Withdraw {
+		toBalance, err = toTransfer(native, GenBalanceKey(currentContract, state.To), state.Value)
+		if err != nil {
+			return 0, 0, err
+		}
 	}
 	return fromBalance, toBalance, nil
 }
@@ -183,6 +216,14 @@ func toTransfer(native *native.NativeService, toKey []byte, value uint64) (uint6
 	return toBalance, nil
 }
 
+func IsLayer2Addr(addr common.Address) bool {
+	if addr.ToHexString() == common.ADDRESS_EMPTY.ToHexString() {
+		return true
+	} else {
+		return false
+	}
+}
+
 func genAddressUnboundOffsetKey(contract, address common.Address) []byte {
 	temp := append(contract[:], UNBOUND_TIME_OFFSET...)
 	return append(temp, address[:]...)