diff --git a/example/Vulkan/VulkanAppFramework.h b/example/Vulkan/VulkanAppFramework.h
index 9e947603..ada7209d 100644
--- a/example/Vulkan/VulkanAppFramework.h
+++ b/example/Vulkan/VulkanAppFramework.h
@@ -75,9 +75,9 @@ public:
         device->AcquireNextImage();
     }
 
-    void Submit(vulkan::CommandBuffer *cmd_buf)
+    void Submit(const VkCommandBuffer cmd_buf)
     {
-        device->QueueSubmit(cmd_buf);
+        device->QueueSubmit(&cmd_buf);
         device->Wait();
         device->QueuePresent();
     }
diff --git a/example/Vulkan/main.cpp b/example/Vulkan/main.cpp
index 3a69b1c4..b35e4695 100644
--- a/example/Vulkan/main.cpp
+++ b/example/Vulkan/main.cpp
@@ -95,7 +95,7 @@ private:
     bool InitPipeline()
     {
         vulkan::PipelineCreater *
-        pipeline_creater=new vulkan::PipelineCreater(device,material);
+        pipeline_creater=new vulkan::PipelineCreater(device,material,device->GetRenderPass());
         pipeline_creater->SetDepthTest(false);
         pipeline_creater->SetDepthWrite(false);
         pipeline_creater->CloseCullFace();
@@ -161,7 +161,11 @@ public:
 
     void Draw() override
     {
-        Submit(cmd_buf[device->GetCurrentFrameIndices()]);
+        const uint32_t frame_index=device->GetCurrentFrameIndices();
+
+        const vulkan::CommandBuffer *cb=cmd_buf[frame_index];
+
+        Submit(*cb);
     }
 };//class TestApp:public VulkanApplicationFramework
 
diff --git a/inc/hgl/graph/vulkan/VKCommandBuffer.h b/inc/hgl/graph/vulkan/VKCommandBuffer.h
index 049cc0f4..7f0b5a50 100644
--- a/inc/hgl/graph/vulkan/VKCommandBuffer.h
+++ b/inc/hgl/graph/vulkan/VKCommandBuffer.h
@@ -25,6 +25,7 @@ public:
     ~CommandBuffer();
 
     operator VkCommandBuffer(){return cmd_buf;}
+    operator const VkCommandBuffer()const{return cmd_buf;}
 
     void SetRenderArea(const VkRect2D &ra){render_area=ra;}
     void SetClearColor(float r,float g,float b,float a=1.0f)
diff --git a/inc/hgl/graph/vulkan/VKDevice.h b/inc/hgl/graph/vulkan/VKDevice.h
index 0426fea6..be111f80 100644
--- a/inc/hgl/graph/vulkan/VKDevice.h
+++ b/inc/hgl/graph/vulkan/VKDevice.h
@@ -109,7 +109,7 @@ public: //Command Buffer 
 public: //Ìá½»Ïà¹Ø
 
     bool AcquireNextImage   ();
-    bool QueueSubmit        (CommandBuffer *);
+    bool QueueSubmit        (const VkCommandBuffer *,const uint32_t count=1);
     bool Wait               (bool wait_all=VK_TRUE,uint64_t time_out=HGL_NANO_SEC_PER_SEC*0.1);
     bool QueuePresent       ();
 };//class Device
diff --git a/src/RenderDevice/Vulkan/VKCommandBuffer.cpp b/src/RenderDevice/Vulkan/VKCommandBuffer.cpp
index d8e86d75..569a252a 100644
--- a/src/RenderDevice/Vulkan/VKCommandBuffer.cpp
+++ b/src/RenderDevice/Vulkan/VKCommandBuffer.cpp
@@ -28,9 +28,9 @@ CommandBuffer::CommandBuffer(VkDevice dev,const VkExtent2D &extent,VkCommandPool
 
 CommandBuffer::~CommandBuffer()
 {
-    VkCommandBuffer cmd_bufs[1] = {cmd_buf};
-    vkFreeCommandBuffers(device, pool, 1, cmd_bufs);
+    vkFreeCommandBuffers(device,pool,1,&cmd_buf);
 }
+
 bool CommandBuffer::Begin()
 {
     VkCommandBufferBeginInfo cmd_buf_info = {};
diff --git a/src/RenderDevice/Vulkan/VKDescriptorSets.cpp b/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
index e32092a7..735acdfe 100644
--- a/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
+++ b/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
@@ -53,13 +53,13 @@ void DescriptorSetLayoutCreater::Bind(const uint32_t binding,VkDescriptorType de
 
 void DescriptorSetLayoutCreater::Bind(const uint32_t *binding,const uint32_t count,VkDescriptorType desc_type,VkShaderStageFlagBits stageFlags)
 {
-    const int old_count=layout_binding_list.GetCount();
+    const uint old_count=layout_binding_list.GetCount();
 
     layout_binding_list.SetCount(old_count+count);
 
     VkDescriptorSetLayoutBinding *p=layout_binding_list.GetData()+old_count;
 
-    for(int i=old_count;i<old_count+count;i++)
+    for(uint i=old_count;i<old_count+count;i++)
     {
         p->binding = *binding;
         p->descriptorType = desc_type;
diff --git a/src/RenderDevice/Vulkan/VKDevice.cpp b/src/RenderDevice/Vulkan/VKDevice.cpp
index 7f1f1a87..781be8e7 100644
--- a/src/RenderDevice/Vulkan/VKDevice.cpp
+++ b/src/RenderDevice/Vulkan/VKDevice.cpp
@@ -201,24 +201,23 @@ bool Device::AcquireNextImage()
     return(vkAcquireNextImageKHR(attr->device,attr->swap_chain,UINT64_MAX,*image_acquired_semaphore,VK_NULL_HANDLE,&current_frame)==VK_SUCCESS);
 }
 
-bool Device::QueueSubmit(CommandBuffer *buf)
+bool Device::QueueSubmit(const VkCommandBuffer *cmd_bufs,const uint32_t count)
 {
-    if(!buf)
+    if(!cmd_bufs)
         return(false);
 
     VkPipelineStageFlags pipe_stage_flags = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
     VkSubmitInfo submit_info = {};
 
     VkSemaphore wait_sem=*image_acquired_semaphore;
-    VkCommandBuffer cmd_bufs=*buf;
 
     submit_info.pNext = nullptr;
     submit_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
     submit_info.waitSemaphoreCount = 1;
     submit_info.pWaitSemaphores = &wait_sem;
     submit_info.pWaitDstStageMask = &pipe_stage_flags;
-    submit_info.commandBufferCount = 1;
-    submit_info.pCommandBuffers = &cmd_bufs;
+    submit_info.commandBufferCount = count;
+    submit_info.pCommandBuffers = cmd_bufs;
     submit_info.signalSemaphoreCount = 0;
     submit_info.pSignalSemaphores = nullptr;