diff --git a/inc/hgl/graph/VKMaterialInstance.h b/inc/hgl/graph/VKMaterialInstance.h
index 2d06dc0c..1d6a6d9f 100644
--- a/inc/hgl/graph/VKMaterialInstance.h
+++ b/inc/hgl/graph/VKMaterialInstance.h
@@ -73,7 +73,7 @@ public:
 
     const   int     GetMIID     ()const{return mi_id;}                          ///<取得材质实例ID
             void *  GetMIData   (){return material->GetMIData(mi_id);}          ///<取得材质实例数据
-            void    WriteMIData (const void *data,const int size);              ///<写入材质实例数据
+            void    WriteMIData (const void *data,const uint32 size);           ///<写入材质实例数据
 
         template<typename T>
             void    WriteMIData (const T &data){WriteMIData(&data,sizeof(T));}  ///<写入材质实例数据
diff --git a/src/SceneGraph/Vulkan/VKMaterialInstance.cpp b/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
index d79f4cef..9182da74 100644
--- a/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
+++ b/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
@@ -36,9 +36,9 @@ void *Material::GetMIData(int id)
     return mi_data_manager->GetData(id);
 }
  
-void MaterialInstance::WriteMIData(const void *data,const int size)
+void MaterialInstance::WriteMIData(const void *data,const uint32 size)
 {
-    if(!data||size<=0||size>material->GetMIDataBytes())return;
+    if(!data||!size||size>material->GetMIDataBytes())return;
 
     void *tp=GetMIData();