diff --git a/internal/nodes/node_status_executor.go b/internal/nodes/node_status_executor.go
index d68121d..d8699b8 100644
--- a/internal/nodes/node_status_executor.go
+++ b/internal/nodes/node_status_executor.go
@@ -31,12 +31,15 @@ type NodeStatusExecutor struct {
 	cpuLogicalCount  int
 	cpuPhysicalCount int
 
+	apiCallStat *rpc.CallStat
+
 	ticker *time.Ticker
 }
 
 func NewNodeStatusExecutor() *NodeStatusExecutor {
 	return &NodeStatusExecutor{
-		ticker: time.NewTicker(30 * time.Second),
+		ticker:      time.NewTicker(30 * time.Second),
+		apiCallStat: rpc.NewCallStat(10),
 	}
 }
 
@@ -78,6 +81,11 @@ func (this *NodeStatusExecutor) update() {
 	status.CacheTotalMemorySize = caches.SharedManager.TotalMemorySize()
 	status.TrafficInBytes = teaconst.InTrafficBytes
 	status.TrafficOutBytes = teaconst.OutTrafficBytes
+
+	apiSuccessPercent, apiAvgCostSeconds := this.apiCallStat.Sum()
+	status.APISuccessPercent = apiSuccessPercent
+	status.APIAvgCostSeconds = apiAvgCostSeconds
+
 	var localFirewall = firewalls.Firewall()
 	if localFirewall != nil && !localFirewall.IsMock() {
 		status.LocalFirewallName = localFirewall.Name()
@@ -125,9 +133,13 @@ func (this *NodeStatusExecutor) update() {
 		remotelogs.Error("NODE_STATUS", "failed to open rpc: "+err.Error())
 		return
 	}
+
+	var before = time.Now()
 	_, err = rpcClient.NodeRPC.UpdateNodeStatus(rpcClient.Context(), &pb.UpdateNodeStatusRequest{
 		StatusJSON: jsonData,
 	})
+	var costSeconds = time.Since(before).Seconds()
+	this.apiCallStat.Add(err == nil, costSeconds)
 	if err != nil {
 		if rpc.IsConnError(err) {
 			remotelogs.Warn("NODE_STATUS", "rpc UpdateNodeStatus() failed: "+err.Error())
@@ -140,7 +152,7 @@ func (this *NodeStatusExecutor) update() {
 
 // 更新CPU
 func (this *NodeStatusExecutor) updateCPU(status *nodeconfigs.NodeStatus) {
-	duration := time.Duration(0)
+	var duration = time.Duration(0)
 	if this.isFirstTime {
 		duration = 100 * time.Millisecond
 	}
diff --git a/internal/rpc/call_stat.go b/internal/rpc/call_stat.go
new file mode 100644
index 0000000..faa15dc
--- /dev/null
+++ b/internal/rpc/call_stat.go
@@ -0,0 +1,66 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package rpc
+
+import (
+	"sync"
+)
+
+type callStatItem struct {
+	ok          bool
+	costSeconds float64
+}
+
+type CallStat struct {
+	size  int
+	items []*callStatItem
+
+	locker sync.Mutex
+}
+
+func NewCallStat(size int) *CallStat {
+	return &CallStat{
+		size: size,
+	}
+}
+
+func (this *CallStat) Add(ok bool, costSeconds float64) {
+	var size = this.size
+	if size <= 0 {
+		size = 10
+	}
+
+	this.locker.Lock()
+	this.items = append(this.items, &callStatItem{
+		ok:          ok,
+		costSeconds: costSeconds,
+	})
+	if len(this.items) > size {
+		this.items = this.items[1:]
+	}
+	this.locker.Unlock()
+}
+
+func (this *CallStat) Sum() (successPercent float64, avgCostSeconds float64) {
+	this.locker.Lock()
+	defer this.locker.Unlock()
+
+	var totalItems = len(this.items)
+	if totalItems == 0 {
+		successPercent = 100
+		return
+	}
+
+	var totalOkItems = 0
+	var totalCostSeconds float64
+	for _, item := range this.items {
+		if item.ok {
+			totalOkItems++
+		}
+		totalCostSeconds += item.costSeconds
+	}
+	successPercent = float64(totalOkItems) * 100 / float64(totalItems)
+	avgCostSeconds = totalCostSeconds / float64(totalItems)
+
+	return
+}
diff --git a/internal/rpc/call_stat_test.go b/internal/rpc/call_stat_test.go
new file mode 100644
index 0000000..9f2107c
--- /dev/null
+++ b/internal/rpc/call_stat_test.go
@@ -0,0 +1,19 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package rpc_test
+
+import (
+	"github.com/TeaOSLab/EdgeNode/internal/rpc"
+	"testing"
+)
+
+func TestNewCallStat(t *testing.T) {
+	var stat = rpc.NewCallStat(10)
+	stat.Add(true, 1)
+	stat.Add(true, 2)
+	stat.Add(true, 3)
+	stat.Add(false, 4)
+	stat.Add(true, 0)
+	stat.Add(true, 1)
+	t.Log(stat.Sum())
+}
diff --git a/internal/rpc/rpc_client.go b/internal/rpc/rpc_client.go
index 652d464..0975b72 100644
--- a/internal/rpc/rpc_client.go
+++ b/internal/rpc/rpc_client.go
@@ -287,14 +287,15 @@ func (this *RPCClient) pickConn() *grpc.ClientConn {
 func (this *RPCClient) Invoke(ctx context.Context, method string, args interface{}, reply interface{}, opts ...grpc.CallOption) error {
 	var conn = this.pickConn()
 	if conn == nil {
-		return errors.New("can not get available grpc connection")
+		return errors.New("could not get available grpc connection")
 	}
 	return conn.Invoke(ctx, method, args, reply, opts...)
 }
+
 func (this *RPCClient) NewStream(ctx context.Context, desc *grpc.StreamDesc, method string, opts ...grpc.CallOption) (grpc.ClientStream, error) {
 	var conn = this.pickConn()
 	if conn == nil {
-		return nil, errors.New("can not get available grpc connection")
+		return nil, errors.New("could not get available grpc connection")
 	}
 	return conn.NewStream(ctx, desc, method, opts...)
 }