diff --git a/strutils.go b/strutils.go
index 0605362..d22c7e3 100644
--- a/strutils.go
+++ b/strutils.go
@@ -79,8 +79,23 @@ func StrContains(s string, substr string) bool {
 
 func ConvertUpperCamelCase(name string) string {
 	newName := ""
+	preIs_ := false
 	for i := 0; i < len(name); i++ {
-		newName += name[i:i]
+		if i == 0 {
+			newName += strings.ToUpper(name[i:i +1])
+			preIs_ = name[i] == '_'
+		} else {
+			if preIs_ {
+				if name[i] != '_' {
+					newName += strings.ToUpper(name[i:i +1])
+				}
+			} else {
+				if name[i] != '_' {
+					newName += name[i:i +1]
+				}
+			}
+			preIs_ = name[i] == '_'
+		}
 	}
 	return newName
 }
diff --git a/timer.go b/timer.go
index bb2e267..ccc4b76 100644
--- a/timer.go
+++ b/timer.go
@@ -9,18 +9,21 @@ const TVN_MASK = TVN_SIZE - 1
 const TVR_MASK = TVR_SIZE - 1
 
 const (
-	DEADLINE_TIMER = 0
-	REPEAT_TIMER = iota
-	FIXED_TIMER = iota
+	TIMEOUT_TIMER = 0
+	INTERVAL_TIMER = iota
 )
 
-type Timer struct {
+type XTimerDestoryHandleNode struct {
+	entry ListHead
+	cb func()
+}
+
+type XTimer struct {
 	freeTimerNum int32
 	freeTimerList ListHead
-	runningTimer *TimerList
+	runningTimer *XTimerList
 	timerTick int64
 	getTickCount func (interface{}) int64
-	getFixedTimerExpires func (interface{}, bool, int32, int64) int64
 	context interface{}
 	cacheTimerNum int32
 	tv1 [TVR_SIZE]ListHead
@@ -30,9 +33,8 @@ type Timer struct {
 	tv5 [TVN_SIZE]ListHead
 }
 
-func (this *Timer) Init(
+func (this *XTimer) Init(
 	getTickCount func (interface{}) int64,
-	getFixedTimerExpires func (interface{}, bool, int32, int64) int64,
 	context interface{},
 	gcTime int32,
 	cacheTimerNum int32)  {
@@ -49,25 +51,19 @@ func (this *Timer) Init(
 	this.timerTick = getTickCount(context)
 	this.context = context
 	this.getTickCount = getTickCount
-	this.getFixedTimerExpires = getFixedTimerExpires
 	this.cacheTimerNum = cacheTimerNum
-	this.AddRepeatTimer(
-		gcTime,
-		func (params *XParams) {
-
-		},
-		this.gcTimerFunc)
+	this.SetInterval(gcTime, this.gcTimerFunc)
 }
 
-func (this *Timer) UnInit() {
+func (this *XTimer) UnInit() {
 	this.clear()
 }
 
-func (this *Timer) clear() {
+func (this *XTimer) clear() {
 	freeTimerFunc := func (data interface{}) {
 		head := data.(*ListHead)
 		for !head.Empty() {
-			timerList := head.FirstEntry().(*TimerList)
+			timerList := head.FirstEntry().(*XTimerList)
 			this.detachTimer(timerList)
 			if !timerList.attachEntry.Empty() {
 				timerList.attachEntry.DelInit()
@@ -82,7 +78,7 @@ func (this *Timer) clear() {
 	TraverseArray(&this.tv5, freeTimerFunc)
 }
 
-func (this *Timer) Update() {
+func (this *XTimer) Update() {
 	for this.getTickCount(this.context) >= this.timerTick {
 		index := uint32(this.timerTick & TVR_MASK)
 
@@ -97,21 +93,15 @@ func (this *Timer) Update() {
 		var workList ListHead
 		this.tv1[index].ReplaceInit(&workList)
 		for !workList.Empty() {
-			timerList := workList.FirstEntry().(*TimerList)
-			this.runningTimer = timerList
-			if timerList.timerFunc != nil {
-				timerList.timerFunc(&timerList.params)
-			}
-			if timerList.timerAfterFunc != nil {
-				timerList.timerAfterFunc(&timerList.params)
-			}
+			timer := workList.FirstEntry().(*XTimerList)
+			this.runningTimer = timer
+			timer.cb(TIMER_EXEC_EVENT, nil)
 			if this.runningTimer != nil {
 				switch this.runningTimer.timerType {
-				case REPEAT_TIMER, FIXED_TIMER:
-					this.modifyTimerEx(timerList, timerList.milliSeconds, false)
-				case DEADLINE_TIMER:
-					this.detachTimer(timerList)
-					this.addToFreeList(timerList)
+				case TIMEOUT_TIMER:
+					this.internalDelete(timer, false, true)
+				case INTERVAL_TIMER:
+					this.internalModifyTime(timer, timer.expireTime)
 				}
 			}
 		}
@@ -119,143 +109,106 @@ func (this *Timer) Update() {
 	this.runningTimer = nil
 }
 
-func (this *Timer) NewTimerAttacher() *TimerAttacher {
-	attacher := new(TimerAttacher)
+func (this *XTimer) NewTimerAttacher() *XTimerAttacher {
+	attacher := new(XTimerAttacher)
 	attacher.timer = this
 	attacher.timers.Init(nil)
 	return attacher
 }
 
-func (this *Timer) AddDeadLineTimer(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddDeadLineTimerEx(milli_seconds, init_func, timer_func, nil)
+func (this *XTimer) SetTimeout(expireTime int32, cb TimerCb) {
+	this.internalSetTimeout(expireTime, cb, nil, nil)
 }
 
-func (this *Timer) AddSimpleDeadLineTimer(
-	milli_seconds int32,
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddDeadLineTimer(milli_seconds, nil, timer_func);
+func (this *XTimer) SetTimeoutEx(expireTime int32, cb TimerCb, attacher *XTimerAttacher) {
+	this.internalSetTimeout(expireTime, cb, attacher, nil)
 }
 
-func (this *Timer) AddDeadLineTimerEx(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams),
-	install_func func (timerList *TimerList, params* XParams)) *TimerList {
-	timerList := this.newTimerList()
-	timerList.params.Reset()
-	if init_func != nil {
-		init_func(&timerList.params)
+func (this *XTimer) SetTimeoutWp(expireTime int32, cb TimerCb) *XTimerWp {
+	var wp *XTimerWp
+	this.internalSetTimeout(expireTime, cb, nil, &wp)
+	return wp
+}
+
+func (this *XTimer) SetTimeoutExWp(expireTime int32, cb TimerCb, attacher *XTimerAttacher) *XTimerWp {
+	var wp *XTimerWp
+	this.internalSetTimeout(expireTime, cb, attacher, &wp)
+	return wp
+}
+
+func (this *XTimer) SetInterval(expireTime int32, cb TimerCb) {
+	this.internalSetInterval(expireTime, cb, nil, nil)
+}
+
+func (this *XTimer) SetIntervalEx(expireTime int32, cb TimerCb,	attacher *XTimerAttacher) {
+	this.internalSetInterval(expireTime, cb, attacher, nil)
+}
+
+func (this *XTimer) SetIntervalWp(expireTime int32, cb TimerCb) *XTimerWp {
+	var wp *XTimerWp
+	this.internalSetInterval(expireTime, cb, nil, &wp)
+	return wp
+}
+
+func (this *XTimer) SetIntervalExWp(expireTime int32, cb TimerCb, attacher *XTimerAttacher) *XTimerWp {
+	var wp *XTimerWp
+	this.internalSetInterval(expireTime, cb, attacher, &wp)
+	return wp
+}
+
+func (this *XTimer) internalSetTimeout(expireTime int32, cb TimerCb, attacher *XTimerAttacher, wpPp**XTimerWp) {
+	timer := this.newTimerList()
+	timer.initTimerList(this, TIMEOUT_TIMER, expireTime, cb)
+	if attacher != nil {
+		attacher.timers.AddTail(&timer.attachEntry)
 	}
-	timerList.initTimerList(this, DEADLINE_TIMER, milli_seconds, timer_func)
-	if install_func != nil {
-		install_func(timerList, &timerList.params)
+	this.internalModifyTime(timer, expireTime)
+	if wpPp != nil {
+		timer.wp = &XTimerWp{
+			timer: timer,
+		}
+		*wpPp = timer.wp
 	}
-	this.ModifyTimer(timerList, milli_seconds)
-	return timerList
 }
 
-func (this *Timer) AddRepeatTimer(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddRepeatTimerEx(milli_seconds, init_func, timer_func, nil)
+func (this *XTimer) internalSetInterval(expireTime int32, cb TimerCb, attacher *XTimerAttacher, wpPp**XTimerWp) {
+	timer := this.newTimerList()
+	timer.initTimerList(this, INTERVAL_TIMER, expireTime, cb)
+	if attacher != nil {
+		attacher.timers.AddTail(&timer.attachEntry)
+	}
+	this.internalModifyTime(timer, expireTime)
+	if wpPp != nil {
+		timer.wp = &XTimerWp{
+			timer: timer,
+		}
+		*wpPp = timer.wp
+	}
 }
 
-func (this *Timer) AddSimpleRepeatTimer(
-	milli_seconds int32,
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddRepeatTimer(milli_seconds, nil, timer_func)
+func (this *XTimer) ModifyTimer(timerWp *XTimerWp, expireTime int32) {
+	if timerWp.Expired() {
+		panic("Xtimer ModifyTimer expired timer")
+	}
+	this.internalModifyTime(timerWp.timer, expireTime)
 }
 
-func (this *Timer) AddRepeatTimerEx(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams),
-	install_func func (timer_list *TimerList, params* XParams)) *TimerList {
-	timerList := this.newTimerList()
-	if init_func != nil {
-		init_func(&timerList.params)
+func (this *XTimer) Delete(timerWp *XTimerWp)  {
+	if timerWp.Expired() {
+		panic("Xtimer Delete expired timer")
 	}
-	timerList.initTimerList(this, REPEAT_TIMER, milli_seconds, timer_func)
-	if install_func != nil {
-		install_func(timerList, &timerList.params)
-	}
-	this.ModifyTimer(timerList, milli_seconds)
-	return timerList
+	this.internalDelete(timerWp.timer, false, true)
 }
 
-func (this *Timer) AddFixedTimer(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddFixedTimerEx(milli_seconds, init_func, timer_func, nil)
+func (this *XTimer) GetRemainTime(timerWp *XTimerWp) int64 {
+	if timerWp.Expired() {
+		panic("Xtimer GetRemainTime expired timer")
+	}
+	return this.internalGetRemainTime(timerWp.timer)
 }
 
-func (this *Timer) AddSimpleFixedTimer(
-	milli_seconds int32,
-	timer_func func (params* XParams)) *TimerList {
-	return this.AddFixedTimer(milli_seconds, nil, timer_func)
-}
-
-func (this *Timer) AddFixedTimerEx(
-	milli_seconds int32,
-	init_func func (params* XParams),
-	timer_func func (params* XParams),
-	install_func func (timer_list *TimerList, params* XParams)) *TimerList {
-	timerList := this.newTimerList()
-	if init_func != nil {
-		init_func(&timerList.params)
-	}
-	timerList.initTimerList(this, FIXED_TIMER, milli_seconds, timer_func)
-	if install_func != nil {
-		install_func(timerList, &timerList.params)
-	}
-	this.ModifyTimer(timerList, milli_seconds)
-	return timerList
-}
-
-func (this *Timer) ModifyTimer(timerList *TimerList, milliSeconds int32) {
-	this.modifyTimerEx(timerList, milliSeconds, true)
-}
-
-func (this *Timer) modifyTimerEx(timerList *TimerList, milliSeconds int32, isFirstAdd bool) {
-	this.detachTimer(timerList)
-	timerList.milliSeconds = milliSeconds
-	if timerList.timerType == FIXED_TIMER {
-		tick := this.getTickCount(this.context)
-		timerList.expires = this.getFixedTimerExpires(
-			this.context,
-			isFirstAdd,
-			milliSeconds,
-			tick)
-	} else {
-		timerList.expires = this.getTickCount(this.context) + int64(milliSeconds)
-	}
-	this.internalAddTimer(timerList)
-}
-
-func (this *Timer) DeleteTimer(timerList *TimerList)  {
-	if timerList == nil {
-		return
-	}
-	if this.runningTimer == timerList {
-		this.runningTimer = nil
-	}
-	if timerList.timerAfterFunc != nil {
-		timerList.timerAfterFunc(&timerList.params)
-	}
-	this.detachTimer(timerList)
-	this.addToFreeList(timerList)
-}
-
-func (this *Timer) GetRemainTime(timerList *TimerList) int64 {
-	if timerList == nil {
-		return 0
-	}
-	remainTime := timerList.expires - this.getTickCount(this.context)
+func (this *XTimer) internalGetRemainTime(timer *XTimerList) int64 {
+	remainTime := timer.expires - this.getTickCount(this.context)
 	if remainTime < 0 {
 		return 0
 	} else {
@@ -263,11 +216,7 @@ func (this *Timer) GetRemainTime(timerList *TimerList) int64 {
 	}
 }
 
-func (this *Timer) GetRunningTimer() *TimerList {
-	return this.runningTimer
-}
-
-func (this *Timer) GetIdleTime() int64 {
+func (this *XTimer) GetIdleTime() int64 {
 	var idleTime int64 = 1
 	for i := (this.timerTick & TVR_MASK); i < TVR_SIZE; i++ {
 		if !this.tv1[i].Empty() {
@@ -278,19 +227,19 @@ func (this *Timer) GetIdleTime() int64 {
 	return idleTime
 }
 
-func (this *Timer) detachTimer(timerList *TimerList)  {
+func (this *XTimer) detachTimer(timerList *XTimerList)  {
 	if !timerList.entry.Empty() {
 		timerList.entry.DelInit()
 	}
 }
 
-func (this *Timer) addToFreeList(timerList *TimerList)  {
+func (this *XTimer) addToFreeList(timerList *XTimerList)  {
 	timerList.reset()
 	this.freeTimerList.AddTail(&timerList.entry)
 	this.freeTimerNum++
 }
 
-func (this *Timer) cascade(tv *[TVN_SIZE]ListHead, index uint32) uint32 {
+func (this *XTimer) cascade(tv *[TVN_SIZE]ListHead, index uint32) uint32 {
 	var cascadeList ListHead
 	tv[index].ReplaceInit(&cascadeList)
 
@@ -298,7 +247,7 @@ func (this *Timer) cascade(tv *[TVN_SIZE]ListHead, index uint32) uint32 {
 		pos := cascadeList.next
 		next := pos.next
 		for pos != &cascadeList  {
-			this.internalAddTimer(pos.data.(*TimerList))
+			this.internalAddTimer(pos.data.(*XTimerList))
 			pos = next
 			next = pos.next
 		}
@@ -306,7 +255,7 @@ func (this *Timer) cascade(tv *[TVN_SIZE]ListHead, index uint32) uint32 {
 	return index
 }
 
-func (this *Timer) internalAddTimer(timerList *TimerList) {
+func (this *XTimer) internalAddTimer(timerList *XTimerList) {
 	timerList.entry.data = timerList
 	expires := timerList.expires
 	idx := expires - this.timerTick
@@ -335,31 +284,80 @@ func (this *Timer) internalAddTimer(timerList *TimerList) {
 	vec.AddTail(&timerList.entry)
 }
 
-func (this *Timer) getTimerIndex(index uint32) uint32 {
+func (this *XTimer) getTimerIndex(index uint32) uint32 {
         return (uint32)((this.timerTick >> (TVR_BITS + index * TVN_BITS)) & TVN_MASK);
 }
 
-func (this *Timer) newTimerList() *TimerList {
+func (this *XTimer) newTimerList() *XTimerList {
 	if !this.freeTimerList.Empty() {
-		timerList := this.freeTimerList.FirstEntry().(*TimerList)
+		timerList := this.freeTimerList.FirstEntry().(*XTimerList)
 		this.freeTimerNum--
 		return timerList
 	} else {
-		timerList := new(TimerList)
+		timerList := new(XTimerList)
 		timerList.init()
 		return timerList
 	}
 }
 
-func (this *Timer) gcTimerFunc(params *XParams) {
-	count := 0
-	for ; !this.freeTimerList.Empty() && this.freeTimerNum > this.cacheTimerNum;  {
-		timerList := this.freeTimerList.FirstEntry().(*TimerList)
-		timerList.entry.DelInit()
-		this.freeTimerNum--
-		count++
-		if count > 1000 {
-			break
+func (this *XTimer) gcTimerFunc(ev int32, args *Args) {
+	if ev == TIMER_EXEC_EVENT {
+		count := 0
+		for ; !this.freeTimerList.Empty() && this.freeTimerNum > this.cacheTimerNum;  {
+			timerList := this.freeTimerList.FirstEntry().(*XTimerList)
+			timerList.entry.DelInit()
+			this.freeTimerNum--
+			count++
+			if count > 1000 {
+				break
+			}
 		}
 	}
 }
+
+func (this *XTimer) internalDelete(timer *XTimerList, isDestory bool, toFreeList bool) {
+	if timer == nil {
+		panic("Xtimer.internalDelete error")
+	}
+	if this.runningTimer == timer {
+		this.runningTimer = nil
+	}
+	this.detachTimer(timer)
+	if !timer.attachEntry.Empty() {
+		timer.attachEntry.DelInit()
+	}
+	if isDestory {
+		timer.cb(TIMER_DESTORY_EVENT, nil)
+	} else {
+		timer.cb(TIMER_DELETE_EVENT, nil)
+	}
+	timer.cb = nil
+	if timer.wp != nil {
+		timer.wp.timer = nil
+		timer.wp = nil
+	}
+	for !timer.destoryHandleList.Empty() {
+		handle := timer.destoryHandleList.FirstEntry().(XTimerDestoryHandleNode)
+		handle.entry.DelInit()
+		handle.cb()
+	}
+	if toFreeList {
+		this.addToFreeList(timer)
+	}
+}
+
+func (this *XTimer) internalModifyTime(timer *XTimerList, expireTime int32) {
+	this.detachTimer(timer)
+	timer.expireTime = expireTime
+	timer.expires = this.getTickCount(this.context) + int64(expireTime)
+	this.internalAddTimer(timer)
+}
+
+func (this *XTimer) clearAttacher(attacher* XTimerAttacher) {
+	var workList ListHead
+	attacher.timers.ReplaceInit(&workList)
+	for !workList.Empty() {
+		timer := workList.FirstEntry().(*XTimerList)
+		this.internalDelete(timer, false, true)
+	}
+}
diff --git a/timerlist.go b/timerlist.go
index 5d21577..e3c69b9 100644
--- a/timerlist.go
+++ b/timerlist.go
@@ -1,62 +1,59 @@
 package q5
 
-type TimerAttacher struct {
-	timer *Timer
+type XTimerWp struct {
+	timer *XTimerList
+}
+
+type XTimerAttacher struct {
+	timer *XTimer
 	timers ListHead
 }
 
-func (this *TimerAttacher) ClearTimers() {
-	var workList ListHead
-	this.timers.ReplaceInit(&workList)
-	for !workList.Empty() {
-		timerList := workList.FirstEntry().(*TimerList)
-		this.timer.DeleteTimer(timerList)
-	}
+func (this *XTimerAttacher) ClearTimers() {
+	this.timer.clearAttacher(this)
 }
 
-type TimerList struct {
+type XTimerList struct {
+	destoryHandleList ListHead
 	entry ListHead
 	attachEntry ListHead
 	timerType int8
-	milliSeconds int32
+	expireTime int32
 	expires int64
 
-	timerFunc func (params *XParams)
-	timerAfterFunc func (params *XParams)
-	params XParams
+	cb TimerCb
+	wp *XTimerWp
 }
 
-func (this *TimerList) initTimerList(
+func (this *XTimerWp) Expired() bool {
+	return this.timer == nil
+}
+
+func (this *XTimerList) initTimerList(
 	timer interface{},
 	timerType int8,
-        millSeconds int32,
-	timerFunc func (params *XParams)) {
+        expireTime int32,
+	cb TimerCb) {
 	this.timerType = timerType
-	this.milliSeconds = millSeconds
-	this.timerFunc = timerFunc
+	this.expireTime = expireTime
+	this.cb = cb
 }
 
-func (this *TimerList) reset() {
+func (this *XTimerList) reset() {
 	if !this.entry.Empty() {
 		this.entry.DelInit()
 	}
 	if !this.attachEntry.Empty() {
 		this.attachEntry.DelInit()
 	}
-	this.timerFunc = nil
-	this.timerAfterFunc = nil
-	this.params.Reset()
+	this.cb = nil
 }
 
-func (this *TimerList) init() {
+func (this *XTimerList) init() {
 	this.entry.Init(this)
 	this.attachEntry.Init(this)
 }
 
-func (this *TimerList) SetTimerAfterFunc(timerAfterFunc func(*XParams)) {
-	this.timerAfterFunc = timerAfterFunc
-}
-
-func (this *TimerList) Attach(timerAttacher *TimerAttacher) {
+func (this *XTimerList) Attach(timerAttacher *XTimerAttacher) {
 	timerAttacher.timers.AddTail(&this.attachEntry)
 }
diff --git a/types.go b/types.go
index 10a210f..b580bfd 100644
--- a/types.go
+++ b/types.go
@@ -1 +1,8 @@
 package q5
+
+type TimerCb func (int32, *Args)
+type Args []interface{}
+
+const TIMER_EXEC_EVENT = 1
+const TIMER_DELETE_EVENT = 2
+const TIMER_DESTORY_EVENT = 3
diff --git a/xparams.go b/xparams.go
deleted file mode 100644
index 08d6f4a..0000000
--- a/xparams.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package q5
-
-type XParams struct {
-	Sender XValue
-	Param1 XValue
-	Param2 XValue
-	Param3 XValue
-}
-
-func (this *XParams) Reset() *XParams {
-	this.Sender.Reset()
-	this.Param1.Reset()
-	this.Param2.Reset()
-	this.Param3.Reset()
-	return this
-}
-
-func (this *XParams) Init(initFunc func (*XParams)) *XParams {
-	initFunc(this)
-	return this
-}