diff --git a/time/wheel.go b/time/wheel.go
index 6078392..dcdf7c8 100644
--- a/time/wheel.go
+++ b/time/wheel.go
@@ -39,19 +39,16 @@ func NewWheel(span time.Duration, buckets int) *Wheel {
 		period: span * (time.Duration(buckets)),
 		ticker: time.NewTicker(span),
 		index:  0,
-		ring:   make([](chan struct{}), buckets),
+		ring:   make([]chan struct{}, buckets),
 		now:    time.Now(),
 	}
 
 	go func() {
 		var notify chan struct{}
-		// var cw CountWatch
-		// cw.Start()
 		for t := range w.ticker.C {
 			w.Lock()
 			w.now = t
 
-			// fmt.Println("index:", w.index, ", value:", w.bitmap.Get(w.index))
 			notify = w.ring[w.index]
 			w.ring[w.index] = nil
 			w.index = (w.index + 1) % len(w.ring)
@@ -62,7 +59,6 @@ func NewWheel(span time.Duration, buckets int) *Wheel {
 				close(notify)
 			}
 		}
-		// fmt.Println("timer costs:", cw.Count()/1e9, "s")
 	}()
 
 	return w
@@ -87,7 +83,6 @@ func (w *Wheel) After(timeout time.Duration) <-chan struct{} {
 	if w.ring[pos] == nil {
 		w.ring[pos] = make(chan struct{})
 	}
-	// fmt.Println("pos:", pos)
 	c := w.ring[pos]
 	w.Unlock()
 
diff --git a/time/wheel_test.go b/time/wheel_test.go
index e58c011..3b1d3bd 100644
--- a/time/wheel_test.go
+++ b/time/wheel_test.go
@@ -24,13 +24,11 @@ func TestWheel(t *testing.T) {
 
 	cw.Start()
 	for {
-		select {
-		case <-wheel.After(TimeMillisecondDuration(1000)):
-			fmt.Println("loop:", index)
-			index++
-			if index >= 150 {
-				return
-			}
+		<-wheel.After(TimeMillisecondDuration(1000))
+		fmt.Println("loop:", index)
+		index++
+		if index >= 150 {
+			return
 		}
 	}
 }
@@ -54,13 +52,11 @@ func TestWheels(t *testing.T) {
 		defer wg.Done()
 		var index int
 		for {
-			select {
-			case <-wheel.After(d):
-				fmt.Println("loop:", index, ", interval:", d)
-				index++
-				if index >= 100 {
-					return
-				}
+			<-wheel.After(d)
+			fmt.Println("loop:", index, ", interval:", d)
+			index++
+			if index >= 100 {
+				return
 			}
 		}
 	}