diff --git a/Board/AP0801.cpp b/Board/AP0801.cpp
index 97884501..ce58b620 100644
--- a/Board/AP0801.cpp
+++ b/Board/AP0801.cpp
@@ -64,6 +64,9 @@ void AP0801::Init(ushort code, cstring name, COM message)
 	WatchDog::Start();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current = &Config::CreateFlash();
 }
diff --git a/Board/AP0802.cpp b/Board/AP0802.cpp
index 16badfdc..c3ed4b48 100644
--- a/Board/AP0802.cpp
+++ b/Board/AP0802.cpp
@@ -51,6 +51,9 @@ void AP0802::Init(ushort code, cstring name, COM message)
 	WatchDog::Start();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current = &Config::CreateFlash();
 
diff --git a/Board/IOK026X.cpp b/Board/IOK026X.cpp
index 4bf9927f..1a9241d9 100644
--- a/Board/IOK026X.cpp
+++ b/Board/IOK026X.cpp
@@ -2,6 +2,7 @@
 
 #include "Kernel\Task.h"
 
+#include "Device\Power.h"
 #include "Device\WatchDog.h"
 #include "Config.h"
 
@@ -51,6 +52,9 @@ void IOK026X::Init(ushort code, cstring name, COM message)
 	WatchDog::Start();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current = &Config::CreateFlash();
 }
diff --git a/Board/IOK027X.cpp b/Board/IOK027X.cpp
index e980477d..2997f6b7 100644
--- a/Board/IOK027X.cpp
+++ b/Board/IOK027X.cpp
@@ -2,6 +2,7 @@
 
 #include "Kernel\Task.h"
 
+#include "Device\Power.h"
 #include "Device\WatchDog.h"
 #include "Config.h"
 #include "Drivers\Esp8266\Esp8266.h"
@@ -50,6 +51,9 @@ void IOK027X::Init(ushort code, cstring name, COM message)
 	WatchDog::Start();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current = &Config::CreateFlash();
 }
diff --git a/Board/IOK0612.cpp b/Board/IOK0612.cpp
index c2393d23..de94b522 100644
--- a/Board/IOK0612.cpp
+++ b/Board/IOK0612.cpp
@@ -2,6 +2,7 @@
 
 #include "Kernel\Task.h"
 
+#include "Device\Power.h"
 #include "Device\WatchDog.h"
 #include "Config.h"
 
@@ -52,6 +53,9 @@ void IOK0612::Init(ushort code, cstring name, COM message)
 	WatchDog::Start();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current	= &Config::CreateFlash();
 }
diff --git a/Board/Pandora.cpp b/Board/Pandora.cpp
index a9c48d9d..d6e3a321 100644
--- a/Board/Pandora.cpp
+++ b/Board/Pandora.cpp
@@ -46,6 +46,9 @@ void PA0903::Init(ushort code, cstring name, COM message)
 	Sys.ShowInfo();
 #endif
 
+	// 系统休眠时自动进入低功耗
+	Power::AttachTimeSleep();
+
 	// Flash最后一块作为配置区
 	Config::Current = &Config::CreateFlash();
 }
diff --git a/Device/Power.cpp b/Device/Power.cpp
index 008bf6c4..7b8e329b 100644
--- a/Device/Power.cpp
+++ b/Device/Power.cpp
@@ -1,5 +1,6 @@
-#include "Device\Power.h"
+#include "Kernel\TTime.h"
 
+#include "Device\Power.h"
 #include "Device\WatchDog.h"
 
 // 低功耗处理器
@@ -12,26 +13,23 @@ void Power::SetPower()
 
 void Power::ChangePower(int level) { }
 
-void Power::Stop(uint msTime)
+void Power::Sleep(int msTime)
 {
-	debug_printf("Power::Stop Time=%d \r\n", msTime);
+	//debug_printf("Power::Sleep Time=%d 仅关闭内核，各外设不变，定时唤醒后继续执行 \r\n", msTime);
 
-	if(!msTime) msTime = 0xFFFF;
-	WatchDog::Start(msTime);
-	
-	OnStop();
+	OnSleep(msTime);
 }
 
-void Power::DeepSleep(uint msTime)
+void Power::Stop(int msTime)
 {
-	debug_printf("Power::DeepSleep Time=%d \r\n", msTime);
+	debug_printf("Power::Stop Time=%d 关闭内核和外设，靠外部中断唤醒，然后继续执行 \r\n", msTime);
 
-	OnDeepSleep();
+	OnStop(msTime);
 }
 
-void Power::Standby(uint msTime)
+void Power::Standby(int msTime)
 {
-	debug_printf("Power::Standby Time=%d \r\n", msTime);
+	debug_printf("Power::Standby Time=%d 全停，只能等专门的引脚或看门狗来唤醒，重新启动 \r\n", msTime);
 
 	for(int i=0; i<_powers.Count(); i++)
 	{
@@ -42,17 +40,30 @@ void Power::Standby(uint msTime)
 			pwr->ChangePower(msTime);
 		}
 	}
-	
-	if(!msTime) msTime = 0xFFFF;
-	WatchDog::Start(msTime);
-	
-	OnStandby();
+
+	/*if(!msTime) msTime = 0xFFFF;
+	WatchDog::Start(msTime);*/
+
+	OnStandby(msTime);
 }
 
 // 各模块向系统注册低功耗句柄，供系统进入低功耗前调用
 void Power::AddPower(Power* power)
 {
 	debug_printf("Power::AddPower 0x%p\r\n", power);
-	
+
 	_powers.Add(power);
 }
+
+void OnTimeSleep(int ms)
+{
+	Power::Sleep(ms);
+}
+
+// 附加到系统时钟，睡眠时进入低功耗
+bool Power::AttachTimeSleep()
+{
+	((TTime&)Time).OnSleep	= OnTimeSleep;
+
+	return true;
+}
diff --git a/Device/Power.h b/Device/Power.h
index 5fa5412e..b5fa2932 100644
--- a/Device/Power.h
+++ b/Device/Power.h
@@ -13,17 +13,20 @@ public:
 	virtual void ChangePower(int level);
 
 	// 低功耗相关
-    static void Stop(uint msTime = 0);
-	static void DeepSleep(uint msTime = 0);
-	static void Standby(uint msTime = 0);
+    static void Sleep(int msTime = 0);
+	static void Stop(int msTime = 0);
+	static void Standby(int msTime = 0);
 
 	// 各模块向系统注册低功耗句柄，供系统进入低功耗前调用
 	static void AddPower(Power* power);
+	
+	// 附加到系统时钟，睡眠时进入低功耗
+	static bool AttachTimeSleep();
 
 private:
-	static void OnStop();
-	static void OnDeepSleep();
-	static void OnStandby();
+	static void OnSleep(int msTime);
+	static void OnStop(int msTime);
+	static void OnStandby(int msTime);
 };
 
 #endif
diff --git a/Device/RTC.cpp b/Device/RTC.cpp
index 3bdf99b7..365ca317 100644
--- a/Device/RTC.cpp
+++ b/Device/RTC.cpp
@@ -19,7 +19,7 @@ HardRTC* HardRTC::Instance()
 
 void FuncLoadTime() { HardRTC::Instance()->LoadTime(); }
 void FuncSaveTime() { HardRTC::Instance()->SaveTime(); }
-int FuncSleep(int ms) { return HardRTC::Instance()->Sleep(ms); }
+void FuncSleep(int ms) { HardRTC::Instance()->Sleep(ms); }
 
 void HardRTC::Start(bool lowpower, bool external)
 {
diff --git a/Device/WatchDog.cpp b/Device/WatchDog.cpp
index a3088b57..5af9c4c4 100644
--- a/Device/WatchDog.cpp
+++ b/Device/WatchDog.cpp
@@ -1,64 +1,17 @@
 #include "WatchDog.h"
 
-/*
-独立看门狗IWDG——有独立时钟（内部低速时钟LSI---40KHz），所以不受系统硬件影响的系统故障探测器。主要用于监视硬件错误。 
-窗口看门狗WWDG——时钟与系统相同。如果系统时钟不走了，这个狗也就失去作用了，主要用于监视软件错误。 
-
-独立看门狗
-看门狗定时时限=IWDG_SetReload()的值 / 看门狗时钟频率
-看门狗时钟频率=LSI（内部低速时钟）的频率（40KHz）/ 分频数
-
-独立看门狗(IWDG)由专用的40kHz的低速时钟为驱动。因此，即使主时钟发生故障它也仍然有效。
-窗口看门狗由从APB1时钟分频后得到的时钟驱动，通过可配置的时间窗口来检测应用程序非正常的过迟或过早的行为。
-IWDG_SetPrescaler()		分频，4~256
-IWDG_SetReload()		计数值12位 0~0x0FFF
-IWDG_ReloadCounter()	喂狗，必须在计数值减到1之前喂狗
-
-IWDG_PR和IWDG_RLR寄存器具有写保护功能。要修改这两个寄存器的值，必须先向IWDG_KR寄存器中写入0x5555。
-以不同的值写入这个寄存器将会打乱操作顺序，寄存器将重新被保护。重装载操作(即写入0xAAAA)也会启动写保护功能。
-
-#define IWDG_WriteAccess_Enable     ((uint16_t)0x5555)
-#define IWDG_WriteAccess_Disable    ((uint16_t)0x0000)
-
-void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
-{
-  assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
-  IWDG->KR = IWDG_WriteAccess;
-}
-
-void IWDG_ReloadCounter(void)
-{
-  IWDG->KR = KR_KEY_Reload;
-}
-void IWDG_Enable(void)
-{
-  IWDG->KR = KR_KEY_Enable;
-}
-
-void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
-{
-  assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));
-  IWDG->PR = IWDG_Prescaler;
-}
-void IWDG_SetReload(uint16_t Reload)
-{
-  assert_param(IS_IWDG_RELOAD(Reload));
-  IWDG->RLR = Reload;
-}
-
-*/
-
-/*WatchDog::WatchDog(uint ms)
-{
-	Timeout = ms;
-	Config(ms);
-}*/
-
+WatchDog::WatchDog() { }
 WatchDog::~WatchDog()
 {
 	ConfigMax();
 }
 
+WatchDog& WatchDog::Current()
+{
+    static WatchDog dog;
+	return dog;
+}
+
 void WatchDog::FeedDogTask(void* param)
 {
     WatchDog* dog = (WatchDog*)param;
@@ -67,18 +20,27 @@ void WatchDog::FeedDogTask(void* param)
 
 void WatchDog::Start(uint ms, uint msFeed)
 {
-    static WatchDog dog;
 	static uint		tid = 0;
 
+	auto& dog	= Current();
 	if(ms > 20000)
-		dog.ConfigMax();
-	else
-		dog.Config(ms);
-
-	if(!tid && msFeed > 0 && msFeed <= 26000)
 	{
-		debug_printf("WatchDog::Start ");
-		// 首次调度为0ms，让调度系统计算得到其平均耗时，其它任务Sleep时也可以喂狗
-		tid = Sys.AddTask(WatchDog::FeedDogTask, &dog, 0, msFeed, "看门狗");
+		dog.ConfigMax();
+
+		if(tid) Sys.RemoveTask(tid);
+	}
+	else
+	{
+		dog.Config(ms);
+		dog.Feed();
+
+		if(!tid && msFeed > 0 && msFeed <= 26000)
+		{
+			debug_printf("WatchDog::Start ");
+			// 首次调度为0ms，让调度系统计算得到其平均耗时，其它任务Sleep时也可以喂狗
+			tid = Sys.AddTask(WatchDog::FeedDogTask, &dog, 0, msFeed, "看门狗");
+		}
+		else
+			debug_printf("WatchDog::Config %dms Feed=%dms \r\n", ms, msFeed);
 	}
 }
diff --git a/Device/WatchDog.h b/Device/WatchDog.h
index 70bd7ee8..fdbf116f 100644
--- a/Device/WatchDog.h
+++ b/Device/WatchDog.h
@@ -7,6 +7,7 @@
 class WatchDog
 {
 private:
+	WatchDog();
 
 public:
 	//WatchDog(uint ms = 3000);
@@ -18,6 +19,7 @@ public:
 	void ConfigMax();		// 看门狗无法关闭，只能设置一个最大值
 	void Feed(); // 喂狗
 
+	static WatchDog& Current();
 	static void FeedDogTask(void* param);
 	// 打开看门狗。最长喂狗时间26208ms，默认2000ms
 	static void Start(uint msTimeout = 2000, uint msFeed = 500);
diff --git a/Kernel/TTime.h b/Kernel/TTime.h
index af78d334..8640373a 100644
--- a/Kernel/TTime.h
+++ b/Kernel/TTime.h
@@ -24,7 +24,7 @@ public:
 	Func OnInit;
 	Func OnLoad;
 	Func OnSave;
-	typedef int (*FuncInt)(int);
+	typedef void (*FuncInt)(int);
 	FuncInt OnSleep;
 
     TTime();
@@ -36,8 +36,8 @@ public:
 	UInt64 Current() const; 		// 当前毫秒数
 	void SetTime(UInt64 seconds);	// 设置时间
 
-	void Sleep(uint ms, bool* running = nullptr) const;
-    void Delay(uint us) const;	// 微秒级延迟
+	void Sleep(int ms, bool* running = nullptr) const;
+    void Delay(int us) const;	// 微秒级延迟
 
 	uint TicksToUs(uint ticks) const;
 	uint UsToTicks(uint us) const;
diff --git a/Kernel/Time.cpp b/Kernel/Time.cpp
index 029612e5..dece4326 100644
--- a/Kernel/Time.cpp
+++ b/Kernel/Time.cpp
@@ -64,41 +64,43 @@ void TTime::SetTime(UInt64 sec)
 	#endif
 #endif
 
-void TTime::Sleep(uint ms, bool* running) const
+void TTime::Sleep(int ms, bool* running) const
 {
     // 睡眠时间太短
-    if(!ms) return;
+    if(ms <= 0) return;
+
+	// 结束时间
+	Int64 end	= Current() + ms;
 
 	// 较大的睡眠时间直接让CPU停下来
 	if(OnSleep && ms >= 10)
 	{
-		uint ms2 = ms;
-		if(OnSleep(ms2) == 0)
+		while(ms >= 10)
 		{
-			// CPU睡眠是秒级，还有剩余量
-			if(ms >= ms2)
-				ms -= ms2;
-			else
-				ms = 0;
+			OnSleep(ms);
+
+			// 判断是否需要继续
+			if(running != nullptr && !*running) break;
+
+			// 重新计算剩下的时间
+			ms	= (int)(end - Current());
 		}
 	}
     // 睡眠时间太短
     if(!ms || (running && !*running)) return;
 
-	uint me	= Current() + ms;
-
+	// 空转
     while(true)
 	{
-		if(Current() >= me) break;
-
+		if(Current() >= end) break;
 		if(running != nullptr && !*running) break;
 	}
 }
 
-void TTime::Delay(uint us) const
+void TTime::Delay(int us) const
 {
     // 睡眠时间太短
-    if(!us) return;
+    if(us <= 0) return;
 
 	// 较大的时间，按毫秒休眠
 	if(us >= 1000)
diff --git a/Platform/GD32F1x0/Power.cpp b/Platform/GD32F1x0/Power.cpp
index 9cfaa1eb..4cfe0395 100644
--- a/Platform/GD32F1x0/Power.cpp
+++ b/Platform/GD32F1x0/Power.cpp
@@ -4,19 +4,22 @@
 
 #include "Platform\stm32.h"
 
-void Power::OnStop()
+void Power::OnSleep(int msTime)
 {
-	PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
+	PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFE);
 }
 
-void Power::OnDeepSleep()
+void Power::OnStop(int msTime)
 {
 #ifdef STM32F0
 	PWR_EnterSleepMode(PWR_SLEEPEntry_WFI);
 #endif
 }
 
-void Power::OnStandby()
+void Power::OnStandby(int msTime)
 {
+	if(!msTime) msTime = 20000;
+	WatchDog::Start(msTime);
+
 	PWR_EnterSTANDBYMode();
 }
diff --git a/Platform/STM32F1/Power.cpp b/Platform/STM32F1/Power.cpp
index 9cfaa1eb..4cfe0395 100644
--- a/Platform/STM32F1/Power.cpp
+++ b/Platform/STM32F1/Power.cpp
@@ -4,19 +4,22 @@
 
 #include "Platform\stm32.h"
 
-void Power::OnStop()
+void Power::OnSleep(int msTime)
 {
-	PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
+	PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFE);
 }
 
-void Power::OnDeepSleep()
+void Power::OnStop(int msTime)
 {
 #ifdef STM32F0
 	PWR_EnterSleepMode(PWR_SLEEPEntry_WFI);
 #endif
 }
 
-void Power::OnStandby()
+void Power::OnStandby(int msTime)
 {
+	if(!msTime) msTime = 20000;
+	WatchDog::Start(msTime);
+
 	PWR_EnterSTANDBYMode();
 }