diff --git a/listhead.go b/listhead.go
index 04248bd..4252fff 100644
--- a/listhead.go
+++ b/listhead.go
@@ -48,4 +48,6 @@ func (this *ListHead) Empty() bool {
 }
 
 func (this *ListHead) DelInit() {
+	this.Del()
+	this.Init()
 }
diff --git a/timer.go b/timer.go
index 4d6cc5d..cc3ac3c 100644
--- a/timer.go
+++ b/timer.go
@@ -92,10 +92,10 @@ func (this *Timer) Update() {
 		index := uint32(this.timerTick & TVR_MASK)
 
 		if index != 0 &&
-		   this.cascade(&this.tv2, this.getTimerIndex(index)) != 0 &&
-		   this.cascade(&this.tv3, this.getTimerIndex(index)) != 0 &&
-		   this.cascade(&this.tv4, this.getTimerIndex(index)) != 0 {
-			this.cascade(&this.tv5, this.getTimerIndex(index))
+		   this.cascade(&this.tv2, this.getTimerIndex(0)) != 0 &&
+		   this.cascade(&this.tv3, this.getTimerIndex(1)) != 0 &&
+		   this.cascade(&this.tv4, this.getTimerIndex(2)) != 0 {
+			this.cascade(&this.tv5, this.getTimerIndex(3))
 		}
 		this.timerTick += 1
 
@@ -270,6 +270,7 @@ func (this *Timer) cascade(tv *[TVN_SIZE]ListHead, index uint32) uint32 {
 }
 
 func (this *Timer) internalAddTimer(timer_list *TimerList) {
+	timer_list.entry.data = timer_list
 	expires := timer_list.expires
 	idx := expires - this.timerTick
 	var vec *ListHead
@@ -308,7 +309,9 @@ func (this *Timer) newTimerList() *TimerList {
 		this.freeTimerNum -= 1
 		return timerList
 	} else {
-		return new(TimerList)
+		timerList := new(TimerList)
+		timerList.entry.Init()
+		return timerList
 	}
 }