diff --git a/Drivers/Enc28j60.cpp b/Drivers/Enc28j60.cpp
index 0d262872..d0555dc1 100644
--- a/Drivers/Enc28j60.cpp
+++ b/Drivers/Enc28j60.cpp
@@ -350,7 +350,7 @@ Enc28j60::~Enc28j60()
 	delete _spi;
 	_spi = NULL;
 
-	if(_ResetTask) Sys.RemoveTask(_ResetTask);
+	Sys.RemoveTask(_ResetTask);
 }
 
 void Enc28j60::Init(Spi* spi, Pin ce, Pin reset)
diff --git a/Drivers/Enc28j60.h b/Drivers/Enc28j60.h
index 40071832..45aeef6c 100644
--- a/Drivers/Enc28j60.h
+++ b/Drivers/Enc28j60.h
@@ -18,7 +18,7 @@ private:
 
 	ulong	LastTime;		// 记录最后一次收到数据的时间，超时重启
 	uint	ResetPeriod;	// 重启间隔，默认6秒
-	int		_ResetTask;		// 重启任务
+	uint	_ResetTask;		// 重启任务
 public:
 	//byte Mac[6];
 	MacAddress Mac;
diff --git a/Drivers/NRF24L01.cpp b/Drivers/NRF24L01.cpp
index 3c85b8b0..46bb20ed 100644
--- a/Drivers/NRF24L01.cpp
+++ b/Drivers/NRF24L01.cpp
@@ -203,15 +203,15 @@ NRF24L01::NRF24L01() { Init(); }
 
 void NRF24L01::Init()
 {
-	Power = NULL;
-	_spi = NULL;
+	Power	= NULL;
+	_spi	= NULL;
 
 	// 初始化地址
 	memset(Address, 0, ArrayLength(Address));
 	memcpy(Address1, (byte*)Sys.ID, ArrayLength(Address1));
-	for(int i=0; i<4; i++) Addr2_5[i] = Address1[0] + i + 1;
-	Channel = 0;	// 默认通道0
-	AddrBits = 0x01;// 默认使能地址0
+	for(int i=0; i<ArrayLength(Addr2_5); i++) Addr2_5[i] = Address1[0] + i + 1;
+	Channel		= 0;	// 默认通道0
+	AddrBits	= 0x01;	// 默认使能地址0
 
 	Timeout		= 50;
 	PayloadWidth= 32;
@@ -227,7 +227,7 @@ void NRF24L01::Init()
 	_tidOpen = 0;
 	_tidRecv = 0;
 
-	_Lock = 0;
+	_Lock	= 0;
 
 	LedTx	= NULL;
 	LedRx	= NULL;
@@ -278,16 +278,9 @@ NRF24L01::~NRF24L01()
 {
     debug_printf("NRF24L01::~NRF24L01\r\n");
 
-	if(_tidOpen)
-	{
-		Sys.RemoveTask(_tidOpen);
-		_tidOpen = 0;
-	}
-	if(_tidOpen)
-	{
-		Sys.RemoveTask(_tidOpen);
-		_tidOpen = 0;
-	}
+	Sys.RemoveTask(_tidOpen);
+	Sys.RemoveTask(_tidOpen);
+
 	Register(NULL);
 
 	// 关闭电源
diff --git a/Drivers/W5500.cpp b/Drivers/W5500.cpp
index 2e47d0ee..8e055023 100644
--- a/Drivers/W5500.cpp
+++ b/Drivers/W5500.cpp
@@ -1139,8 +1139,7 @@ void HardSocket::Register(TransportHandler handler, void* param)
 	}
 	else
 	{
-		if(_tidRecv) Sys.RemoveTask(_tidRecv);
-		_tidRecv = 0;
+		Sys.RemoveTask(_tidRecv);
 	}
 }
 
@@ -1160,8 +1159,7 @@ void TcpClient::Init()
 TcpClient::~TcpClient() //: ~HardSockets()
 {
 	HardSocket::~HardSocket();
-	if(_tidRodyguard) Sys.RemoveTask(_tidRodyguard);
-	_tidRodyguard = 0;
+	Sys.RemoveTask(_tidRodyguard);
 }
 
 void TcpClient::RodyguardTask(void* param)
diff --git a/SerialPort.cpp b/SerialPort.cpp
index ffad13ad..1eb6dc73 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -371,7 +371,7 @@ void SerialPort::Register(TransportHandler handler, void* param)
 	}
     else
 	{
-		if(_taskidRx) Sys.RemoveTask(_taskidRx);
+		Sys.RemoveTask(_taskidRx);
 	}
 }
 
diff --git a/Sys.cpp b/Sys.cpp
index 333b7a75..04a0c5cf 100644
--- a/Sys.cpp
+++ b/Sys.cpp
@@ -114,7 +114,7 @@ bool SysError(uint code)
 
 #if DEBUG
 	ShowFault(code);
-	
+
 	SerialPort* sp = SerialPort::GetMessagePort();
 	if(sp) sp->Flush();
 #endif
@@ -560,13 +560,16 @@ uint TSys::AddTask(Action func, void* param, Int64 dueTime, Int64 period, string
 	return Task::Scheduler()->Add(func, param, dueTime, period, name);
 }
 
-void TSys::RemoveTask(uint taskid)
+void TSys::RemoveTask(uint& taskid)
 {
-	Task::Scheduler()->Remove(taskid);
+	if(taskid) Task::Scheduler()->Remove(taskid);
+	taskid = 0;
 }
 
 bool TSys::SetTask(uint taskid, bool enable, int usNextTime)
 {
+	if(!taskid) return false;
+
 	Task* task = Task::Get(taskid);
 	if(!task) return false;
 
@@ -584,6 +587,8 @@ bool TSys::SetTask(uint taskid, bool enable, int usNextTime)
 // 改变任务周期
 bool TSys::SetTaskPeriod(uint taskid, Int64 period)
 {
+	if(!taskid) return false;
+
 	Task* task = Task::Get(taskid);
 	if(!task) return false;
 
diff --git a/Sys.h b/Sys.h
index 37acb2c8..72a40a8d 100644
--- a/Sys.h
+++ b/Sys.h
@@ -127,7 +127,7 @@ private:
 public:
 	// 创建任务，返回任务编号。dueTime首次调度时间us，period调度间隔us，-1表示仅处理一次
 	uint AddTask(Action func, void* param, Int64 dueTime = 0, Int64 period = 0, string name = NULL);
-	void RemoveTask(uint taskid);
+	void RemoveTask(uint& taskid);
 	// 设置任务的开关状态，同时运行指定任务最近一次调度的时间，0表示马上调度
 	bool SetTask(uint taskid, bool enable, int usNextTime = -1);
 	// 改变任务周期
diff --git a/TinyNet/TinyClient.cpp b/TinyNet/TinyClient.cpp
index 40e2920b..af266f37 100644
--- a/TinyNet/TinyClient.cpp
+++ b/TinyNet/TinyClient.cpp
@@ -53,11 +53,7 @@ void TinyClient::Open()
 
 void TinyClient::Close()
 {
-	if(_TaskID)
-	{
-		Sys.RemoveTask(_TaskID);
-		_TaskID = 0;
-	}
+	Sys.RemoveTask(_TaskID);
 
 	Control->Received	= NULL;
 	Control->Param		= NULL;
diff --git a/TinyNet/TinyClient.h b/TinyNet/TinyClient.h
index d34d676d..388c8ec5 100644
--- a/TinyNet/TinyClient.h
+++ b/TinyNet/TinyClient.h
@@ -11,7 +11,7 @@
 class TinyClient
 {
 private:
-	int			_TaskID;
+	uint		_TaskID;
 
 public:
 	TinyController* Control;
diff --git a/TinyNet/TinyMessage.cpp b/TinyNet/TinyMessage.cpp
index a9de4813..602fd403 100644
--- a/TinyNet/TinyMessage.cpp
+++ b/TinyNet/TinyMessage.cpp
@@ -188,7 +188,7 @@ TinyController::TinyController() : Controller()
 
 TinyController::~TinyController()
 {
-	if(_taskID) Sys.RemoveTask(_taskID);
+	Sys.RemoveTask(_taskID);
 }
 
 void TinyController::Open()
diff --git a/TokenNet/TokenClient.cpp b/TokenNet/TokenClient.cpp
index 5bfab2a4..571885d3 100644
--- a/TokenNet/TokenClient.cpp
+++ b/TokenNet/TokenClient.cpp
@@ -51,11 +51,7 @@ void TokenClient::Open()
 
 void TokenClient::Close()
 {
-	if(_task)
-	{
-		Sys.RemoveTask(_task);
-		_task = 0;
-	}
+	Sys.RemoveTask(_task);
 }
 
 bool TokenClient::Send(TokenMessage& msg)
diff --git a/TokenNet/TokenMessage.cpp b/TokenNet/TokenMessage.cpp
index 1368272e..9c213d33 100644
--- a/TokenNet/TokenMessage.cpp
+++ b/TokenNet/TokenMessage.cpp
@@ -178,12 +178,10 @@ void TokenController::Open()
 
 void TokenController::Close()
 {
-	if(!Stat)
-	{
-		delete Stat;
-		Stat = NULL;
-	}
-	if(_taskID) Sys.RemoveTask(_taskID);
+	delete Stat;
+	Stat = NULL;
+
+	Sys.RemoveTask(_taskID);
 }
 
 // 发送消息，传输口参数为空时向所有传输口发送消息
diff --git a/TokenNet/TokenMessage.h b/TokenNet/TokenMessage.h
index 2a95da79..ef5b4f89 100644
--- a/TokenNet/TokenMessage.h
+++ b/TokenNet/TokenMessage.h
@@ -87,9 +87,9 @@ public:
 
 	// 统计
 private:
-	TokenStat* Stat;
+	TokenStat*	Stat;
 
-	int		_taskID;
+	uint		_taskID;
 
 	void ShowStat();
 	static void StatTask(void* param);