diff --git a/app.go b/app.go
index e14289b..d069fbf 100644
--- a/app.go
+++ b/app.go
@@ -79,13 +79,14 @@ type app struct {
 	ormDbHash         map[string]*gorm.DB
 	caHandlersMutex   sync.RWMutex
 	caHandlers        map[string]GinHandlerFunc
-	pendingAsyncTask  map[string]map[string][]*LockAsyncTask
+	pendingAsyncTask  map[string]*q5.ListHead
 }
 
 func (this *app) init(userApp UserApp) {
 	this.userApp = userApp
 	this.nowTime = time.Now()
 	this.pid = os.Getpid()
+	this.pendingAsyncTask = make(map[string]*q5.ListHead)
 	this.ormDbHash = make(map[string]*gorm.DB)
 	this.SetTimeOffset(0)
 	atomic.StoreInt64(&this.nowUnixNano, this.nowTime.UnixNano())
@@ -385,6 +386,45 @@ func (this *app) GetPid() int {
 	return this.pid
 }
 
+func (this *app) forcePendingAsyncTask(key string) *q5.ListHead {
+	if l, ok := this.pendingAsyncTask[key]; ok {
+		return l
+	} else {
+		l := q5.NewListHead()
+		this.pendingAsyncTask[key] = l
+		return l
+	}
+}
+
+func (this *app) isFirstAsyncTask(key string, entry *q5.ListHead) bool {
+	if l, ok := this.pendingAsyncTask[key]; ok {
+		return l.IsFirst(entry)
+	} else {
+		panic("app.isFirstAsyncTask key not exists:" + key)
+	}
+}
+
+func (this *app) notifyNextTask(key string) {
+	if l, ok := this.pendingAsyncTask[key]; ok {
+		if !l.Empty() {
+			task := l.FirstEntry().(*LockAsyncTask)
+			task.checkDo()
+		}
+	}
+}
+
+func (this *app) clearEmptyPendingAsyncTask(key string) {
+	deletedKeys := make(map[string]int32)
+	if l, ok := this.pendingAsyncTask[key]; ok {
+		if l.Empty() {
+			deletedKeys[key] = 1
+		}
+	}
+	for k, _ := range(deletedKeys) {
+		delete(this.pendingAsyncTask, k)
+	}
+}
+
 func parseArgs() (int, int) {
 	args := os.Args[1:]
 	if len(args) <= 0 {
diff --git a/async_task.go b/async_task.go
index 7d95133..b60699a 100644
--- a/async_task.go
+++ b/async_task.go
@@ -5,6 +5,7 @@ import (
 )
 
 type taskLock struct {
+	key string
 	entry q5.ListHead
 }
 
@@ -14,7 +15,7 @@ type AsyncTask struct {
 	succCb func(*AsyncTask)
 	failCb func(*AsyncTask)
 	execTimes int64
-	lockKeys [][]string
+	lockKeys map[string]*taskLock
 }
 
 type LockAsyncTask = AsyncTask
@@ -72,36 +73,76 @@ func (this *AsyncTask) Continue() *AsyncTask {
 	return this
 }
 
-func (this *AsyncTask) do() *AsyncTask {
+func (this *AsyncTask) checkDo() *AsyncTask {
 	if !this.IsRunning() {
 		panic("task is not runing")
 	}
-	GetApp().RegisterMainThreadCb(
-		func () {
-			this.cb(this)
-			this.execTimes += 1
-		})
+	if this.allIsReady() {
+		GetApp().RegisterMainThreadCb(
+			func () {
+				this.cb(this)
+				this.execTimes += 1
+			})
+	}
 	return this
 }
 
 func (this *AsyncTask) OnSucc(cb func(*AsyncTask)) *AsyncTask {
+	this.ClearLocks()
 	this.succCb = cb
 	return this
 }
 
 func (this *AsyncTask) OnFail(cb func(*AsyncTask)) *AsyncTask {
+	this.ClearLocks()
 	this.failCb = cb
 	return this
 }
 
+func (this *AsyncTask) allIsReady() bool {
+	var allReady = true
+	for _, lock := range(this.lockKeys) {
+		if !_app.isFirstAsyncTask(lock.key, &lock.entry) {
+			allReady = false
+			break
+		}
+	}
+	return allReady
+}
+
+func (this *AsyncTask) ClearLocks() {
+	for _, lock := range(this.lockKeys) {
+		lock.entry.DelInit()
+	}
+	for _, lock := range(this.lockKeys) {
+		_app.clearEmptyPendingAsyncTask(lock.key)
+	}
+	for _, lock := range(this.lockKeys) {
+		_app.notifyNextTask(lock.key)
+	}
+}
+
 func NewAsyncTask(cb func(*AsyncTask)) *AsyncTask {
 	p := new(AsyncTask)
-	p.lockKeys = [][]string{}
+	p.lockKeys = make(map[string]*taskLock)
 	return p.init(cb).Continue()
 }
 
 func NewLockAsyncTask(keys [][]string, cb func(*LockAsyncTask)) *LockAsyncTask {
 	p := new(AsyncTask)
-	p.lockKeys = [][]string{}
-	return p.init(cb).Continue()
+	p.lockKeys = make(map[string]*taskLock)
+	for _, val := range(keys) {
+		if len(val) != 2 {
+			panic("NewLockAsyncTask len error:" + q5.EncodeJson(val))
+		}
+		lock := new(taskLock)
+		lock.key = val[0] + val[1]
+		lock.entry.Init(p)
+		if _, ok := p.lockKeys[lock.key]; ok {
+			panic("NewLockAsyncTask duplicate key:" + lock.key)
+		}
+		p.lockKeys[lock.key] = lock
+		_app.forcePendingAsyncTask(lock.key).AddTail(&lock.entry)
+	}
+	return p.init(cb).checkDo()
 }