diff --git a/inc/hgl/graph/VKPhysicalDevice.h b/inc/hgl/graph/VKPhysicalDevice.h
index 91f0d229..6159b98d 100644
--- a/inc/hgl/graph/VKPhysicalDevice.h
+++ b/inc/hgl/graph/VKPhysicalDevice.h
@@ -48,6 +48,20 @@ public:
 
     const uint32_t          GetConstantSize ()const{return properties.limits.maxPushConstantsSize;}
 
+    // support != open, so please don't direct use GetFeatures().
+    // open any features in CreateDevice()&SetDeviceFeatures() functions.
+    const bool              IsSupportMDI    ()const
+    {
+        // I found a few device support MDI, but its MaxDrawIndirectCount is 1.
+
+        return (features.multiDrawIndirect&&properties.limits.maxDrawIndirectCount>1);
+    }
+
+    const uint32_t          GetMaxMDICount  ()const
+    {
+        return properties.limits.maxDrawIndirectCount;
+    }
+
 public:
 
     /**
diff --git a/src/SceneGraph/Vulkan/VKCommandBufferRender.cpp b/src/SceneGraph/Vulkan/VKCommandBufferRender.cpp
index 62c2f0c5..af6f6703 100644
--- a/src/SceneGraph/Vulkan/VKCommandBufferRender.cpp
+++ b/src/SceneGraph/Vulkan/VKCommandBufferRender.cpp
@@ -170,7 +170,7 @@ void RenderCmdBuffer::DrawIndirect( VkBuffer        buffer,
                                     uint32_t        drawCount,
                                     uint32_t        stride)
 {
-    if(this->dev_attr->physical_device->GetFeatures().multiDrawIndirect)
+    if(this->dev_attr->physical_device->IsSupportMDI())
         vkCmdDrawIndirect(cmd_buf,buffer,offset,drawCount,stride);
     else
     for(uint32_t i=0;i<drawCount;i++)
@@ -182,7 +182,7 @@ void RenderCmdBuffer::DrawIndexedIndirect(  VkBuffer        buffer,
                                             uint32_t        drawCount,
                                             uint32_t        stride)
 {
-    if(this->dev_attr->physical_device->GetFeatures().multiDrawIndirect)
+    if(this->dev_attr->physical_device->IsSupportMDI())
         vkCmdDrawIndexedIndirect(cmd_buf,buffer,offset,drawCount,stride);
     else
     for(uint32_t i=0;i<drawCount;i++)