diff --git a/app.go b/app.go
index 1f0fb83..ed0c647 100644
--- a/app.go
+++ b/app.go
@@ -52,6 +52,7 @@ type app struct {
 	imMsgHandlers [1024]func(q5.Args)
 	maxRunDelay int64
 	maxScheduleTime int64
+	uuid q5.Uuid
 	userApp UserApp
 }
 
@@ -81,6 +82,7 @@ func (this *app) init(userApp UserApp) {
 		this.instanceId = int32(tmpInstanceId)
 		flag.Parse()
 	}
+	this.uuid.SetMachineId((this.nodeId - 1) * MAX_NODE_ID + this.instanceId)
 	this.loopCond = sync.NewCond(new(sync.Mutex))
 	this.chGoLoopTimerExit = make(chan int)
 	this.chGoLoopWait = make(chan int64)
@@ -124,7 +126,7 @@ func (this *app) run() {
 }
 
 func (this *app) NewUuid() int64 {
-	return 0
+	return this.uuid.Generate()
 }
 
 func (this *app) GetInstanceId() int32 {
diff --git a/constant.go b/constant.go
index 15ba654..65f4069 100644
--- a/constant.go
+++ b/constant.go
@@ -7,3 +7,6 @@ const (
 const (
 	WSP_SS_MAX_MSGID = 100
 )
+
+const MAX_NODE_ID = 8
+const MAX_INSTANCE_ID = 500