diff --git a/core/Base/Time.cpp b/core/Base/Time.cpp
index 79aafd27..a2b57872 100644
--- a/core/Base/Time.cpp
+++ b/core/Base/Time.cpp
@@ -59,7 +59,7 @@ void e2d::Time::__updateLast()
 
 	s_tNow = steady_clock::now();
 	s_nInterval = static_cast<int>(duration_cast<milliseconds>(s_tNow - s_tLastUpdate).count());
-	s_fTotalTime = static_cast<double>(duration_cast<milliseconds>(s_tNow - s_tStart).count()) / 1000.0f;
+	s_fTotalTime = static_cast<double>(duration_cast<milliseconds>(s_tNow - s_tStart).count()) / 1000.0;
 }
 
 void e2d::Time::__sleep()
diff --git a/core/Tool/Timer.cpp b/core/Tool/Timer.cpp
index 95882ce5..7b43e60c 100644
--- a/core/Tool/Timer.cpp
+++ b/core/Tool/Timer.cpp
@@ -16,15 +16,43 @@ e2d::Timer::Timer()
 	TimerManager::add(this);
 }
 
-e2d::Timer::Timer(const String & name, const TimerCallback & callback, double interval /* = 0 */, int repeatTimes /* = -1 */, bool atOnce /* = false */, bool autoRelease /* = false */)
-	: Timer()
+e2d::Timer::Timer(const TimerCallback & callback, double interval /* = 0 */, int updateTimes /* = -1 */, bool atOnce /* = false */, bool autoRelease /* = false */)
+	: m_bRunning(false)
+	, m_nRunTimes(0)
+	, m_Callback(nullptr)
+	, m_fInterval(0)
+	, m_fLast(0)
+	, m_nUpdateTimes(-1)
+	, m_bAtOnce(false)
+	, m_bAutoRelease(false)
+	, m_bClear(false)
 {
-	this->setName(name);
 	this->setCallback(callback);
-	this->setUpdateTimes(repeatTimes);
+	this->setUpdateTimes(updateTimes);
 	this->setInterval(interval);
 	m_bAutoRelease = autoRelease;
 	m_bAtOnce = atOnce;
+	TimerManager::add(this);
+}
+
+e2d::Timer::Timer(const String & name, const TimerCallback & callback, double interval /* = 0 */, int updateTimes /* = -1 */, bool atOnce /* = false */, bool autoRelease /* = false */)
+	: m_bRunning(false)
+	, m_nRunTimes(0)
+	, m_Callback(nullptr)
+	, m_fInterval(0)
+	, m_fLast(0)
+	, m_nUpdateTimes(-1)
+	, m_bAtOnce(false)
+	, m_bAutoRelease(false)
+	, m_bClear(false)
+{
+	this->setName(name);
+	this->setCallback(callback);
+	this->setUpdateTimes(updateTimes);
+	this->setInterval(interval);
+	m_bAutoRelease = autoRelease;
+	m_bAtOnce = atOnce;
+	TimerManager::add(this);
 }
 
 bool e2d::Timer::isRunning() const
@@ -69,9 +97,10 @@ void e2d::Timer::setCallback(const TimerCallback & callback)
 	m_Callback = callback;
 }
 
-void e2d::Timer::setUpdateTimes(int repeatTimes)
+void e2d::Timer::setUpdateTimes(int updateTimes)
 {
-	m_nUpdateTimes = repeatTimes;
+	m_nUpdateTimes = updateTimes;
+	m_bClear = (m_nUpdateTimes == 0);
 }
 
 void e2d::Timer::setRunAtOnce(bool bAtOnce)
@@ -81,7 +110,7 @@ void e2d::Timer::setRunAtOnce(bool bAtOnce)
 
 void e2d::Timer::update()
 {
-	if (m_Callback && m_nRunTimes < m_nUpdateTimes)
+	if (m_Callback)
 	{
 		m_Callback();
 	}
@@ -89,7 +118,7 @@ void e2d::Timer::update()
 	m_nRunTimes++;
 	m_fLast += m_fInterval;
 
-	if (m_nRunTimes >= m_nUpdateTimes)
+	if (m_nRunTimes == m_nUpdateTimes)
 	{
 		if (m_bAutoRelease)
 		{
@@ -104,7 +133,7 @@ void e2d::Timer::update()
 
 bool e2d::Timer::isReady() const
 {
-	if (m_bRunning)
+	if (m_bRunning && !m_bClear)
 	{
 		if (m_bAtOnce && m_nRunTimes == 0)
 			return true;
@@ -113,9 +142,7 @@ bool e2d::Timer::isReady() const
 			return true;
 
 		if ((Time::getTotalTime() - m_fLast) >= m_fInterval)
-		{
 			return true;
-		}
 	}
 	return false;
 }
diff --git a/core/etools.h b/core/etools.h
index f18682ea..b0e41fea 100644
--- a/core/etools.h
+++ b/core/etools.h
@@ -49,6 +49,14 @@ class Timer :
 public:
 	Timer();
 
+	Timer(
+		const TimerCallback &callback,	/* 定时器回调函数 */
+		double interval = 0,			/* 时间间隔（秒） */
+		int times = -1,					/* 执行次数（设 -1 为永久执行） */
+		bool atOnce = false,			/* 是否立即执行 */
+		bool autoRelease = false		/* 自动清除 */
+	);
+
 	Timer(
 		const String &name,				/* 定时器名称 */
 		const TimerCallback &callback,	/* 定时器回调函数 */
diff --git a/project/vs2012/Easy2D.vcxproj b/project/vs2012/Easy2D.vcxproj
index c9a82584..fd82e125 100644
--- a/project/vs2012/Easy2D.vcxproj
+++ b/project/vs2012/Easy2D.vcxproj
@@ -54,7 +54,9 @@
     <ClCompile Include="..\..\core\Common\Font.cpp" />
     <ClCompile Include="..\..\core\Common\Image.cpp" />
     <ClCompile Include="..\..\core\Common\Object.cpp" />
+    <ClCompile Include="..\..\core\Common\Point.cpp" />
     <ClCompile Include="..\..\core\Common\Scene.cpp" />
+    <ClCompile Include="..\..\core\Common\Size.cpp" />
     <ClCompile Include="..\..\core\Common\String.cpp" />
     <ClCompile Include="..\..\core\Manager\ActionManager.cpp" />
     <ClCompile Include="..\..\core\Manager\MusicManager.cpp" />
diff --git a/project/vs2012/Easy2D.vcxproj.filters b/project/vs2012/Easy2D.vcxproj.filters
index cd68fa89..aeb84b3b 100644
--- a/project/vs2012/Easy2D.vcxproj.filters
+++ b/project/vs2012/Easy2D.vcxproj.filters
@@ -191,5 +191,11 @@
     <ClCompile Include="..\..\core\Shape\Rect.cpp">
       <Filter>Shape</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\core\Common\Point.cpp">
+      <Filter>Common</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\core\Common\Size.cpp">
+      <Filter>Common</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/project/vs2013/Easy2D.vcxproj b/project/vs2013/Easy2D.vcxproj
index 54264b33..3b4c867b 100644
--- a/project/vs2013/Easy2D.vcxproj
+++ b/project/vs2013/Easy2D.vcxproj
@@ -193,7 +193,9 @@
     <ClCompile Include="..\..\core\Common\Font.cpp" />
     <ClCompile Include="..\..\core\Common\Image.cpp" />
     <ClCompile Include="..\..\core\Common\Object.cpp" />
+    <ClCompile Include="..\..\core\Common\Point.cpp" />
     <ClCompile Include="..\..\core\Common\Scene.cpp" />
+    <ClCompile Include="..\..\core\Common\Size.cpp" />
     <ClCompile Include="..\..\core\Common\String.cpp" />
     <ClCompile Include="..\..\core\Manager\ActionManager.cpp" />
     <ClCompile Include="..\..\core\Manager\MusicManager.cpp" />
diff --git a/project/vs2013/Easy2D.vcxproj.filters b/project/vs2013/Easy2D.vcxproj.filters
index f12aa1dd..778a987a 100644
--- a/project/vs2013/Easy2D.vcxproj.filters
+++ b/project/vs2013/Easy2D.vcxproj.filters
@@ -192,5 +192,11 @@
     <ClCompile Include="..\..\core\Shape\Rect.cpp">
       <Filter>Shape</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\core\Common\Point.cpp">
+      <Filter>Common</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\core\Common\Size.cpp">
+      <Filter>Common</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file