diff --git a/common/config/config.go b/common/config/config.go
index 8afb0fa0..37a703d7 100644
--- a/common/config/config.go
+++ b/common/config/config.go
@@ -78,9 +78,9 @@ const (
 )
 
 var NETWORK_MAGIC = map[uint32]uint32{
-	NETWORK_ID_MAIN_NET:    constants.NETWORK_MAIGIC_MAINNET, //Network main
-	NETWORK_ID_POLARIS_NET: constants.NETWORK_MAIGIC_POLARIS, //Network polaris
-	NETWORK_ID_SOLO_NET:    0,                                //Network solo
+	NETWORK_ID_MAIN_NET:    constants.NETWORK_MAGIC_MAINNET, //Network main
+	NETWORK_ID_POLARIS_NET: constants.NETWORK_MAGIC_POLARIS, //Network polaris
+	NETWORK_ID_SOLO_NET:    0,                               //Network solo
 }
 
 var NETWORK_NAME = map[uint32]string{
diff --git a/common/constants/constants.go b/common/constants/constants.go
index 88a98014..3745973c 100644
--- a/common/constants/constants.go
+++ b/common/constants/constants.go
@@ -68,9 +68,13 @@ var UNBOUND_DEADLINE = (func() uint32 {
 })()
 
 // multi-sig constants
-const MULTI_SIG_MAX_PUBKEY_SIZE = 1024
+const MULTI_SIG_MAX_PUBKEY_SIZE = 16
 
+// transaction constants
+const TX_MAX_SIG_SIZE = 16
+
+// network magic number
 const (
-	NETWORK_MAIGIC_MAINNET = 0x74746e41
-	NETWORK_MAIGIC_POLARIS = 0x74746e41
+	NETWORK_MAGIC_MAINNET = 0x74746e41
+	NETWORK_MAGIC_POLARIS = 0x74746e41
 )
diff --git a/core/types/transaction.go b/core/types/transaction.go
index 04257fa9..8d6c8682 100644
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@@ -26,6 +26,7 @@ import (
 
 	"github.com/ontio/ontology-crypto/keypair"
 	"github.com/ontio/ontology/common"
+	"github.com/ontio/ontology/common/constants"
 	"github.com/ontio/ontology/common/serialization"
 	"github.com/ontio/ontology/core/payload"
 	"github.com/ontio/ontology/core/program"
@@ -211,6 +212,10 @@ func (tx *Transaction) Deserialize(r io.Reader) error {
 		return errors.NewDetailErr(err, errors.ErrNoCode, "[Deserialize], Transaction sigs length deserialize error.")
 	}
 
+	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++ {
 		sig := new(Sig)
 		err := sig.Deserialize(r)
diff --git a/core/validation/transaction_validator.go b/core/validation/transaction_validator.go
index 5669c475..75746780 100644
--- a/core/validation/transaction_validator.go
+++ b/core/validation/transaction_validator.go
@@ -54,6 +54,12 @@ func VerifyTransactionWithLedger(tx *types.Transaction, ledger *ledger.Ledger) o
 
 func checkTransactionSignatures(tx *types.Transaction) error {
 	hash := tx.Hash()
+
+	lensig := len(tx.Sigs)
+	if lensig > constants.TX_MAX_SIG_SIZE {
+		return fmt.Errorf("transaction signature number %d execced %d", lensig, constants.TX_MAX_SIG_SIZE)
+	}
+
 	address := make(map[common.Address]bool, len(tx.Sigs))
 	for _, sig := range tx.Sigs {
 		m := int(sig.M)