diff --git a/inc/hgl/graph/vulkan/VKRenderTarget.h b/inc/hgl/graph/vulkan/VKRenderTarget.h
index 24a8929a..9b727c4e 100644
--- a/inc/hgl/graph/vulkan/VKRenderTarget.h
+++ b/inc/hgl/graph/vulkan/VKRenderTarget.h
@@ -17,8 +17,9 @@ protected:
     Framebuffer *fb;
     
     VkExtent2D extent;
-
-    CommandBuffer *command_buffer;
+    
+    Semaphore *     render_complete_semaphore   =nullptr;
+    CommandBuffer * command_buffer              =nullptr;
 
 protected:
 
@@ -36,14 +37,17 @@ public:
 
     virtual ~RenderTarget();
     
-            const   VkExtent2D &    GetExtent       ()const {return extent;}
-                    CommandBuffer * GetCommandBuffer()      {return command_buffer;}
-    virtual const   VkRenderPass    GetRenderPass   ()const {return fb->GetRenderPass();}
-    virtual const   uint32_t        GetColorCount   ()const {return fb->GetColorCount();}
-    virtual const   VkFramebuffer   GetFramebuffer  ()const {return fb->GetFramebuffer();}
+            const   VkExtent2D &    GetExtent           ()const {return extent;}
+                    Semaphore *     GetCompleteSemaphore(){return render_complete_semaphore;}
+                    CommandBuffer * GetCommandBuffer    ()      {return command_buffer;}
+    virtual const   VkRenderPass    GetRenderPass       ()const {return fb->GetRenderPass();}
+    virtual const   uint32_t        GetColorCount       ()const {return fb->GetColorCount();}
+    virtual const   VkFramebuffer   GetFramebuffer      ()const {return fb->GetFramebuffer();}
 
-    virtual         Texture2D *     GetColorTexture (const int index=0){return color_texture[index];}
-    virtual         Texture2D *     GetDepthTexture (){return depth_texture;}
+    virtual         Texture2D *     GetColorTexture     (const int index=0){return color_texture[index];}
+    virtual         Texture2D *     GetDepthTexture     (){return depth_texture;}
+
+    virtual         bool            Submit              (Semaphore *present_complete_semaphore=nullptr);
 };//class RenderTarget
 
 /**
diff --git a/inc/hgl/graph/vulkan/VKSubmitQueue.h b/inc/hgl/graph/vulkan/VKSubmitQueue.h
index f8a0e02a..358ae128 100644
--- a/inc/hgl/graph/vulkan/VKSubmitQueue.h
+++ b/inc/hgl/graph/vulkan/VKSubmitQueue.h
@@ -21,6 +21,7 @@ public:
     SubmitQueue(Device *dev,VkQueue q,const uint32_t fence_count=1);
     virtual ~SubmitQueue();
     
+    bool QueueWaitIdle();
     bool Wait(const bool wait_wall=true,const uint64_t time_out=HGL_NANO_SEC_PER_SEC);
     bool Submit(const VkCommandBuffer &cmd_buf,vulkan::Semaphore *wait_sem,vulkan::Semaphore *complete_sem);
     bool Submit(const VkCommandBuffer *cmd_buf,const uint32_t count,vulkan::Semaphore *wait_sem,vulkan::Semaphore *complete_sem);
diff --git a/src/RenderDevice/Vulkan/VKRenderTarget.cpp b/src/RenderDevice/Vulkan/VKRenderTarget.cpp
index 4db944eb..874aca5a 100644
--- a/src/RenderDevice/Vulkan/VKRenderTarget.cpp
+++ b/src/RenderDevice/Vulkan/VKRenderTarget.cpp
@@ -2,6 +2,7 @@
 #include<hgl/graph/vulkan/VKDevice.h>
 #include<hgl/graph/vulkan/VKSwapchain.h>
 #include<hgl/graph/vulkan/VKCommandBuffer.h>
+#include<hgl/graph/vulkan/VKSemaphore.h>
 
 VK_NAMESPACE_BEGIN
 namespace 
@@ -14,7 +15,8 @@ RenderTarget::RenderTarget(Device *dev,Framebuffer *_fb,CommandBuffer *_cb,const
     fb=_fb;
     command_buffer=_cb;
 
-    depth_texture=nullptr;
+    depth_texture=nullptr;    
+    render_complete_semaphore=dev->CreateSem();
 }
 
 RenderTarget::RenderTarget(Device *dev,Framebuffer *_fb,CommandBuffer *_cb,Texture2D **ctl,const uint32_t cc,Texture2D *dt,const uint32_t fence_count):SubmitQueue(dev,dev->GetGraphicsQueue(),fence_count)
@@ -24,16 +26,23 @@ RenderTarget::RenderTarget(Device *dev,Framebuffer *_fb,CommandBuffer *_cb,Textu
 
     color_texture.Add(ctl,cc);
     depth_texture=dt;
+    render_complete_semaphore=dev->CreateSem();
 }
 
 RenderTarget::~RenderTarget()
-{
+{    
     SAFE_CLEAR(depth_texture);
     color_texture.Clear();
-
+    
+    SAFE_CLEAR(render_complete_semaphore);
     SAFE_CLEAR(command_buffer);
 }
 
+bool RenderTarget::Submit(Semaphore *present_complete_semaphore)
+{
+    return this->SubmitQueue::Submit(*command_buffer,present_complete_semaphore,render_complete_semaphore);
+}
+
 SwapchainRenderTarget::SwapchainRenderTarget(Device *dev,Swapchain *sc):RenderTarget(dev,nullptr,nullptr,sc->GetImageCount())
 {
     swapchain=sc;
@@ -95,11 +104,6 @@ bool SwapchainRenderTarget::PresentBackbuffer(VkSemaphore *render_complete_semap
 		} 
 	}
 
-    result=vkQueueWaitIdle(queue);
-    
-    if(result!=VK_SUCCESS)
-        return(false);
-
     return(true);
 }
 VK_NAMESPACE_END
diff --git a/src/RenderDevice/Vulkan/VKSubmitQueue.cpp b/src/RenderDevice/Vulkan/VKSubmitQueue.cpp
index 49965530..583efb87 100644
--- a/src/RenderDevice/Vulkan/VKSubmitQueue.cpp
+++ b/src/RenderDevice/Vulkan/VKSubmitQueue.cpp
@@ -26,11 +26,20 @@ SubmitQueue::~SubmitQueue()
     fence_list.Clear();
 }
 
+bool SubmitQueue::QueueWaitIdle()
+{
+    VkResult result=vkQueueWaitIdle(queue);
+    
+    if(result!=VK_SUCCESS)
+        return(false);
+
+    return(true);
+}
+
 bool SubmitQueue::Wait(const bool wait_all,uint64_t time_out)
 {
-    VkFence fence=*fence_list[current_fence];
-    
     VkResult result;
+    VkFence fence=*fence_list[current_fence];
 
     result=vkWaitForFences(device->GetDevice(),1,&fence,wait_all,time_out);
     result=vkResetFences(device->GetDevice(),1,&fence);