diff --git a/src/entity/process.go b/src/entity/process.go
index 0e248ff..63f3314 100644
--- a/src/entity/process.go
+++ b/src/entity/process.go
@@ -106,13 +106,13 @@ type ProcessStatus struct {
 }
 
 type ProcessInfo struct {
-	Name           string  `json:"name"`
-	Pid            string  `json:"pid"`
-	CpuUtilization *float64 `json:"cpuUtilization"`
-	PhyRSS         *int     `json:"phyRSS"`
-	VmSize         *int     `json:"vmRSS"`
-	Threads        *int     `json:"threadCount"`
-	FPS            *int     `json:"fps"`
+	Name           string   `json:"name"`
+	Pid            string   `json:"pid"`
+	CpuUtilization *float64 `json:"cpuUtilization,omitempty"`
+	PhyRSS         *int     `json:"phyRSS,omitempty"`
+	VmSize         *int     `json:"vmRSS,omitempty"`
+	Threads        *int     `json:"threadCount,omitempty"`
+	FPS            *int     `json:"fps,omitempty"`
 }
 
 func (i *ProcessInfo) ToJson() string {
@@ -125,7 +125,7 @@ func (i *ProcessInfo) ToFormat() string {
 	return string(str)
 }
 
-func (i *ProcessInfo) ToString() string{
+func (i *ProcessInfo) ToString() string {
 	return i.ToJson()
 }
 
diff --git a/src/perfmonUtil/process.go b/src/perfmonUtil/process.go
index 3b2eae9..bdc88fb 100644
--- a/src/perfmonUtil/process.go
+++ b/src/perfmonUtil/process.go
@@ -332,24 +332,23 @@ var sleepTime = 1.0 // # seconds
 var HZ = 100.0      //# ticks/second
 var cpuUtilization = 0.0
 
-func GetProcessInfo(client *adb.Device, pid string, packageName string,perfOptions entity.PerfOption, interval int64) (*entity.ProcessInfo, error) {
+func GetProcessInfo(client *adb.Device, pid string, packageName string, perfOptions entity.PerfOption, interval int64) (processInfo *entity.ProcessInfo, err error) {
 	sleepTime = float64(interval)
-
-	stat, err := getStatOnPid(client, pid)
+	var stat *entity.ProcessStat
+	stat, err = getStatOnPid(client, pid)
 	if err != nil {
 		return nil, err
 	}
-	status, err := getStatusOnPid(client, pid)
+	var status *entity.ProcessStatus
+	status, err = getStatusOnPid(client, pid)
 	if err != nil {
 		return nil, err
 	}
-	//ioData, err := getIoDataOnPid(client, pid)
-	//if err != nil {
-	//	return nil, err
-	//}
-	var processInfo entity.ProcessInfo
 
-	if perfOptions.ProcThreads{
+	if perfOptions.ProcThreads {
+		if processInfo == nil {
+			processInfo = &entity.ProcessInfo{}
+		}
 		var threads int
 		if threads, err = strconv.Atoi(status.Threads); err != nil {
 			return nil, err
@@ -358,17 +357,25 @@ func GetProcessInfo(client *adb.Device, pid string, packageName string,perfOptio
 	}
 
 	if perfOptions.ProcMem {
+		if processInfo == nil {
+			processInfo = &entity.ProcessInfo{}
+		}
 		processInfo.PhyRSS = &stat.Rss
 		processInfo.VmSize = &stat.Vsize
 	}
 
 	if perfOptions.ProcCPU {
+		if processInfo == nil {
+			processInfo = &entity.ProcessInfo{}
+		}
 		getCpuUsage(client, pid)
 		processInfo.CpuUtilization = &cpuUtilization
 	}
 
-
-	if perfOptions.ProcFPS{
+	if perfOptions.ProcFPS {
+		if processInfo == nil {
+			processInfo = &entity.ProcessInfo{}
+		}
 		var fps = 0
 
 		fps, err = getProcessFPSBySurfaceFlinger(client, packageName)
@@ -382,7 +389,7 @@ func GetProcessInfo(client *adb.Device, pid string, packageName string,perfOptio
 
 	processInfo.Name = status.Name
 	processInfo.Pid = status.Pid
-	return &processInfo, nil
+	return
 }
 
 func getProcessFPSByGFXInfo(client *adb.Device, pid string) (result int, err error) {
diff --git a/src/perfmonUtil/system.go b/src/perfmonUtil/system.go
index 8fdd13c..0379f84 100644
--- a/src/perfmonUtil/system.go
+++ b/src/perfmonUtil/system.go
@@ -26,10 +26,11 @@ import (
 	"strings"
 )
 
-func GetSystemStats(client *adb.Device, perfOptions entity.PerfOption) (*entity.SystemInfo, error) {
-	stats := &entity.SystemInfo{}
-	var err error
+func GetSystemStats(client *adb.Device, perfOptions entity.PerfOption) (stats *entity.SystemInfo, err error) {
 	if perfOptions.SystemCPU {
+		if stats == nil {
+			stats = &entity.SystemInfo{}
+		}
 		err = getCPU(client, stats)
 		if err != nil {
 			return nil, err
@@ -37,6 +38,9 @@ func GetSystemStats(client *adb.Device, perfOptions entity.PerfOption) (*entity.
 	}
 
 	if perfOptions.SystemMem {
+		if stats == nil {
+			stats = &entity.SystemInfo{}
+		}
 		stats.MemInfo = &entity.SystemMemInfo{}
 		err = getMemInfo(client, stats)
 		if err != nil {
@@ -45,6 +49,9 @@ func GetSystemStats(client *adb.Device, perfOptions entity.PerfOption) (*entity.
 	}
 
 	if perfOptions.SystemNetWorking {
+		if stats == nil {
+			stats = &entity.SystemInfo{}
+		}
 		err = getInterfaces(client, stats)
 		if err != nil {
 			return nil, err