diff --git a/example/Vulkan/VKCommandBuffer.cpp b/example/Vulkan/VKCommandBuffer.cpp
index 907ebbcf..1d3f4824 100644
--- a/example/Vulkan/VKCommandBuffer.cpp
+++ b/example/Vulkan/VKCommandBuffer.cpp
@@ -7,7 +7,7 @@
 #include"VKDescriptorSets.h"
 
 VK_NAMESPACE_BEGIN
-CommandBuffer::CommandBuffer(VkDevice dev,VkCommandPool cp,VkCommandBuffer cb)
+CommandBuffer::CommandBuffer(VkDevice dev,const VkExtent2D &extent,VkCommandPool cp,VkCommandBuffer cb)
 {
     device=dev;
     pool=cp;
@@ -19,6 +19,10 @@ CommandBuffer::CommandBuffer(VkDevice dev,VkCommandPool cp,VkCommandBuffer cb)
     clear_values[0].color.float32[3] = 0.2f;
     clear_values[1].depthStencil.depth = 1.0f;
     clear_values[1].depthStencil.stencil = 0;
+
+    render_area.offset.x=0;
+    render_area.offset.y=0;
+    render_area.extent=extent;
 }
 
 CommandBuffer::~CommandBuffer()
@@ -29,6 +33,15 @@ CommandBuffer::~CommandBuffer()
 
 bool CommandBuffer::Begin(RenderPass *rp,Framebuffer *fb)
 {
+    VkCommandBufferBeginInfo cmd_buf_info = {};
+    cmd_buf_info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
+    cmd_buf_info.pNext = nullptr;
+    cmd_buf_info.flags = 0;
+    cmd_buf_info.pInheritanceInfo = nullptr;
+
+    if(vkBeginCommandBuffer(cmd_buf, &cmd_buf_info)!=VK_SUCCESS)
+        return(false);
+
     VkRenderPassBeginInfo rp_begin;
 
     rp_begin.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
@@ -40,7 +53,6 @@ bool CommandBuffer::Begin(RenderPass *rp,Framebuffer *fb)
     rp_begin.pClearValues = clear_values;
 
     vkCmdBeginRenderPass(cmd_buf, &rp_begin, VK_SUBPASS_CONTENTS_INLINE);
-
     return(true);
 }
 
@@ -55,8 +67,8 @@ bool CommandBuffer::Bind(Pipeline *p)
 bool CommandBuffer::Bind(PipelineLayout *pl)
 {
     if(!pl)return(false);
-
-    vkCmdBindDescriptorSets(cmd_buf, VK_PIPELINE_BIND_POINT_GRAPHICS, *pl, 0, pl->GetDescriptorSetCount(),pl->GetDescriptorSets(), 0, nullptr);
+    if(pl->GetDescriptorSetCount()>0)
+        vkCmdBindDescriptorSets(cmd_buf, VK_PIPELINE_BIND_POINT_GRAPHICS, *pl, 0, pl->GetDescriptorSetCount(),pl->GetDescriptorSets(), 0, nullptr);
     return(true);
 }
 
@@ -70,9 +82,7 @@ bool CommandBuffer::Bind(VertexInput *vi,const VkDeviceSize offset)
     if(buf_list.GetCount()<=0)
         return(false);
 
-    VkDeviceSize zero_offsets[1]={offset};
-
-    vkCmdBindVertexBuffers(cmd_buf,0,buf_list.GetCount(),buf_list.GetData(),zero_offsets);
+    vkCmdBindVertexBuffers(cmd_buf,0,buf_list.GetCount(),buf_list.GetData(),&offset);
     return(true);
 }
 
@@ -86,8 +96,9 @@ void CommandBuffer::Draw(const uint32_t vertex_count,const uint32_t instance_cou
     vkCmdDraw(cmd_buf,vertex_count,instance_count,first_vertex,first_instance);
 }
 
-void CommandBuffer::End()
+bool CommandBuffer::End()
 {
     vkCmdEndRenderPass(cmd_buf);
+    return(vkEndCommandBuffer(cmd_buf)==VK_SUCCESS);
 }
 VK_NAMESPACE_END
diff --git a/example/Vulkan/VKCommandBuffer.h b/example/Vulkan/VKCommandBuffer.h
index 46620635..80deb4e0 100644
--- a/example/Vulkan/VKCommandBuffer.h
+++ b/example/Vulkan/VKCommandBuffer.h
@@ -20,7 +20,7 @@ class CommandBuffer
 
 public:
 
-    CommandBuffer(VkDevice dev,VkCommandPool cp,VkCommandBuffer cb);
+    CommandBuffer(VkDevice dev,const VkExtent2D &extent,VkCommandPool cp,VkCommandBuffer cb);
     ~CommandBuffer();
 
     operator VkCommandBuffer(){return cmd_buf;}
@@ -46,7 +46,7 @@ public:
     bool Bind(VertexInput *vi,const VkDeviceSize offset=0);
     void Draw(const uint32_t vertex_count);
     void Draw(const uint32_t vertex_count,const uint32_t instance_count,const uint32_t first_vertex=0,const uint32_t first_instance=0);
-    void End();
+    bool End();
 };//class CommandBuffer
 VK_NAMESPACE_END
 #endif//HGL_GRAPH_VULKAN_COMMAND_BUFFER_INCLUDE
diff --git a/example/Vulkan/VKDevice.cpp b/example/Vulkan/VKDevice.cpp
index f0b6d6c7..ff852ba8 100644
--- a/example/Vulkan/VKDevice.cpp
+++ b/example/Vulkan/VKDevice.cpp
@@ -126,7 +126,7 @@ CommandBuffer *Device::CreateCommandBuffer()
     if(res!=VK_SUCCESS)
         return(nullptr);
 
-    return(new CommandBuffer(attr->device,attr->cmd_pool,cmd_buf));
+    return(new CommandBuffer(attr->device,attr->swapchain_extent,attr->cmd_pool,cmd_buf));
 }
 
 RenderPass *Device::CreateRenderPass()
diff --git a/example/Vulkan/VKDevice.h b/example/Vulkan/VKDevice.h
index 614bdcec..c951c3e8 100644
--- a/example/Vulkan/VKDevice.h
+++ b/example/Vulkan/VKDevice.h
@@ -42,6 +42,11 @@ public:
     VkDescriptorPool        GetDescriptorPool   ()      {return attr->desc_pool;}
     VkPipelineCache         GetPipelineCache    ()      {return attr->pipeline_cache;}
 
+public:
+
+    VkImageView             GetColorImageView   (int index=-1)  {return GetObject(attr->sc_image_views,index==-1?current_framebuffer:index);}
+    VkImageView             GetDepthImageView   ()              {return attr->depth.view;}
+
 public:
 
     Buffer *            CreateBuffer(VkBufferUsageFlags buf_usage,VkDeviceSize size,VkSharingMode sharing_mode=VK_SHARING_MODE_EXCLUSIVE);
diff --git a/example/Vulkan/main.cpp b/example/Vulkan/main.cpp
index ed55f531..e9d1c184 100644
--- a/example/Vulkan/main.cpp
+++ b/example/Vulkan/main.cpp
@@ -13,6 +13,7 @@
 #include"VKFence.h"
 #include"VKSemaphore.h"
 #include"VKFormat.h"
+#include"VKFramebuffer.h"
 
 #include<fstream>
 
@@ -104,6 +105,16 @@ vulkan::VertexInput *CreateVertexBuffer(vulkan::Device *dev)
     return vi;
 }
 
+void wait_seconds(int seconds) {
+#ifdef WIN32
+    Sleep(seconds * 1000);
+#elif defined(__ANDROID__)
+    sleep(seconds);
+#else
+    sleep(seconds);
+#endif
+}
+
 int main(int,char **)
 {
     #ifdef _DEBUG
@@ -140,15 +151,15 @@ int main(int,char **)
 
     vulkan::CommandBuffer *cmd_buf=device->CreateCommandBuffer();
 
-    vulkan::Buffer *ubo=device->CreateUBO(1024);
+    //vulkan::Buffer *ubo=device->CreateUBO(1024);
 
-    uint8_t *p=ubo->Map();
+    //uint8_t *p=ubo->Map();
 
-    if(p)
-    {
-        memset(p,0,1024);
-        ubo->Unmap();
-    }
+    //if(p)
+    //{
+    //    memset(p,0,1024);
+    //    ubo->Unmap();
+    //}
 
     vulkan::Shader *shader=LoadShader(device->GetDevice());
 
@@ -178,6 +189,23 @@ int main(int,char **)
     if(!pipeline)
         return(-4);
 
+    device->AcquireNextImage();     //这样才会得到current_framebuffer的值，下面的device->GetColorImageView()才会正确
+
+    vulkan::Framebuffer *fb=vulkan::CreateFramebuffer(device,rp,device->GetColorImageView(),device->GetDepthImageView());
+
+    cmd_buf->Begin(rp,fb);
+    cmd_buf->Bind(pipeline);
+    cmd_buf->Bind(pl);
+    cmd_buf->Bind(vi);
+    cmd_buf->Draw(3);
+    cmd_buf->End();
+
+    device->QueueSubmit(cmd_buf,fence);
+    device->Wait(fence);
+    device->QueuePresent();
+
+    wait_seconds(3);
+
     delete pipeline;
 
     delete sem;
@@ -185,7 +213,7 @@ int main(int,char **)
     delete rp;
 
     delete vi;
-    delete ubo;
+//    delete ubo;
 
     delete cmd_buf;
     delete device;