diff --git a/inc/hgl/graph/VKMaterial.h b/inc/hgl/graph/VKMaterial.h
index 47d41fb4..2f181abd 100644
--- a/inc/hgl/graph/VKMaterial.h
+++ b/inc/hgl/graph/VKMaterial.h
@@ -76,8 +76,9 @@ public:
 
 public:
 
-    const uint32_t GetMIDataBytes   ()const{return mi_data_bytes;}
-    const uint32_t GetMIMaxCount    ()const{return mi_max_count;}
+    const bool      HasMI           ()const{return !mi_data_bytes;}
+    const uint32_t  GetMIDataBytes  ()const{return mi_data_bytes;}
+    const uint32_t  GetMIMaxCount   ()const{return mi_max_count;}
 
     void ReleaseMI(int);    ///<释放材质实例
     void *GetMIData(int);   ///<取得指定ID号的材质实例数据访问指针
diff --git a/src/SceneGraph/MaterialRenderList.cpp b/src/SceneGraph/MaterialRenderList.cpp
index b4b43d72..33bb0911 100644
--- a/src/SceneGraph/MaterialRenderList.cpp
+++ b/src/SceneGraph/MaterialRenderList.cpp
@@ -91,7 +91,9 @@ void MaterialRenderList::End()
 
     if(node_count<=0)return;
 
-    StatMI();
+    if(mtl->HasMI())
+        StatMI();
+
     Stat();
 
     //写入LocalToWorld数据
@@ -116,6 +118,8 @@ void MaterialRenderList::StatMI()
     {
         //超出最大数量了怎么办？？？
     }
+
+    
 }
 
 void MaterialRenderList::Stat()
diff --git a/src/SceneGraph/RenderAssignBuffer.cpp b/src/SceneGraph/RenderAssignBuffer.cpp
index f3d46aa2..ad0d1e94 100644
--- a/src/SceneGraph/RenderAssignBuffer.cpp
+++ b/src/SceneGraph/RenderAssignBuffer.cpp
@@ -8,6 +8,18 @@
 
 VK_NAMESPACE_BEGIN
 
+RenderAssignBuffer::RenderAssignBuffer(GPUDevice *dev,const uint mi_total_bytes)
+{
+    hgl_zero(*this);
+
+    device=dev;
+
+    if(mi_total_bytes>0)
+        ubo_mi=device->CreateUBO(mi_total_bytes);
+    else
+        ubo_mi=nullptr;
+}
+
 VkBuffer RenderAssignBuffer::GetAssignVBO()const
 {
     return vbo_assigns->GetBuffer();
@@ -44,15 +56,16 @@ void RenderAssignBuffer::Alloc(const uint nc,const uint mc)
         ubo_l2w=device->CreateUBO(node_count*sizeof(Matrix4f));
     }
 
-    {
-        mi_count=power_to_2(mc);
-
-        ubo_mi=device->CreateUBO(mi_count*mi_data_bytes);
-    }
-
     vbo_assigns=device->CreateVBO(ASSIGN_VBO_FMT,node_count);
 }
 
+bool RenderAssignBuffer::WriteMIData(void *mi_data,const uint bytes)
+{
+    if(!mi_data||!bytes||!ubo_mi)return(false);
+
+    return ubo_mi->Write(mi_data,bytes);
+}
+
 void RenderAssignBuffer::WriteNode(RenderNode *render_node,const uint count,const MaterialInstanceSets &mi_set)
 {
     RenderNode *rn;
diff --git a/src/SceneGraph/RenderAssignBuffer.h b/src/SceneGraph/RenderAssignBuffer.h
index da9c785f..949247a6 100644
--- a/src/SceneGraph/RenderAssignBuffer.h
+++ b/src/SceneGraph/RenderAssignBuffer.h
@@ -37,8 +37,6 @@ private:
     uint node_count;                    ///<渲染节点数量
     DeviceBuffer *ubo_l2w;              ///<Local2World数据
 
-    uint mi_count;                      ///<材质实例数量
-    uint mi_data_bytes;                 ///<单个材质实例数据字节数
     DeviceBuffer *ubo_mi;               ///<材质实例数据
     
     //Assign VBO
@@ -58,17 +56,10 @@ public:
 
 public:
 
-    RenderAssignBuffer(GPUDevice *dev,const uint mi_bytes)
-    {
-        hgl_zero(*this);
-
-        device=dev;
-
-        mi_data_bytes=mi_bytes;
-    }
-
+    RenderAssignBuffer(GPUDevice *dev,const uint mi_total_bytes);
     ~RenderAssignBuffer(){Clear();}
 
+    bool WriteMIData(void *,const uint);
     void WriteNode(RenderNode *render_node,const uint count,const MaterialInstanceSets &mi_set);
 
 };//struct RenderAssignBuffer