diff --git a/timingwheel/timingwheel.go b/timingwheel/timingwheel.go
index a27d334..251993a 100644
--- a/timingwheel/timingwheel.go
+++ b/timingwheel/timingwheel.go
@@ -1,20 +1,10 @@
 package timingwheel
 
 import (
-	"github.com/siddontang/golib/log"
 	"sync"
 	"time"
 )
 
-type TaskFunc func()
-
-type bucket struct {
-	c     chan struct{}
-	tasks []TaskFunc
-}
-
-const defaultTasksSize = 16
-
 type TimingWheel struct {
 	sync.Mutex
 
@@ -25,7 +15,7 @@ type TimingWheel struct {
 
 	maxTimeout time.Duration
 
-	buckets []bucket
+	cs []chan struct{}
 
 	pos int
 }
@@ -40,11 +30,10 @@ func NewTimingWheel(interval time.Duration, buckets int) *TimingWheel {
 
 	w.maxTimeout = time.Duration(interval * (time.Duration(buckets)))
 
-	w.buckets = make([]bucket, buckets)
+	w.cs = make([]chan struct{}, buckets)
 
-	for i := range w.buckets {
-		w.buckets[i].c = make(chan struct{})
-		w.buckets[i].tasks = make([]TaskFunc, 0, defaultTasksSize)
+	for i := range w.cs {
+		w.cs[i] = make(chan struct{})
 	}
 
 	w.ticker = time.NewTicker(interval)
@@ -64,29 +53,15 @@ func (w *TimingWheel) After(timeout time.Duration) <-chan struct{} {
 
 	w.Lock()
 
-	index := (w.pos + int(timeout/w.interval)) % len(w.buckets)
+	index := (w.pos + int(timeout/w.interval)) % len(w.cs)
 
-	b := w.buckets[index].c
+	b := w.cs[index]
 
 	w.Unlock()
 
 	return b
 }
 
-func (w *TimingWheel) AddTask(timeout time.Duration, f TaskFunc) {
-	if timeout >= w.maxTimeout {
-		panic("timeout too much, over maxtimeout")
-	}
-
-	w.Lock()
-
-	index := (w.pos + int(timeout/w.interval)) % len(w.buckets)
-
-	w.buckets[index].tasks = append(w.buckets[index].tasks, f)
-
-	w.Unlock()
-}
-
 func (w *TimingWheel) run() {
 	for {
 		select {
@@ -102,30 +77,12 @@ func (w *TimingWheel) run() {
 func (w *TimingWheel) onTicker() {
 	w.Lock()
 
-	lastC := w.buckets[w.pos].c
-	tasks := w.buckets[w.pos].tasks
+	lastC := w.cs[w.pos]
+	w.cs[w.pos] = make(chan struct{})
 
-	w.buckets[w.pos].c = make(chan struct{})
-	w.buckets[w.pos].tasks = w.buckets[w.pos].tasks[0:0:defaultTasksSize]
-
-	w.pos = (w.pos + 1) % len(w.buckets)
+	w.pos = (w.pos + 1) % len(w.cs)
 
 	w.Unlock()
 
 	close(lastC)
-
-	if len(tasks) > 0 {
-		f := func(tasks []TaskFunc) {
-			defer func() {
-				if e := recover(); e != nil {
-					log.Fatal("run task fatal %v", e)
-				}
-			}()
-			for _, task := range tasks {
-				task()
-			}
-		}
-
-		go f(tasks)
-	}
 }
diff --git a/timingwheel/timingwheel_test.go b/timingwheel/timingwheel_test.go
index fce45d1..8aa09a6 100644
--- a/timingwheel/timingwheel_test.go
+++ b/timingwheel/timingwheel_test.go
@@ -6,29 +6,12 @@ import (
 )
 
 func TestTimingWheel(t *testing.T) {
-	w := NewTimingWheel(1*time.Second, 10)
+	w := NewTimingWheel(100*time.Millisecond, 10)
 
-	println(time.Now().Unix())
 	for {
 		select {
-		case <-w.After(1 * time.Second):
-			println(time.Now().Unix())
+		case <-w.After(200 * time.Millisecond):
 			return
 		}
 	}
 }
-
-func TestTask(t *testing.T) {
-	w := NewTimingWheel(1*time.Second, 10)
-
-	r := make(chan struct{})
-	f := func() {
-		println("hello world")
-		r <- struct{}{}
-	}
-
-	w.AddTask(1*time.Second, f)
-
-	<-r
-	println("over")
-}