diff --git a/inc/hgl/graph/MaterialRenderList.h b/inc/hgl/graph/MaterialRenderList.h
index 0d92a5d4..6da221f3 100644
--- a/inc/hgl/graph/MaterialRenderList.h
+++ b/inc/hgl/graph/MaterialRenderList.h
@@ -2,7 +2,7 @@
 #include<hgl/graph/RenderNode.h>
 
 VK_NAMESPACE_BEGIN
-struct RenderNodeExtraBuffer;
+struct RenderExtraBuffer;
 
 /**
 * ͬһ���ʵĶ�����Ⱦ�б�
@@ -18,7 +18,7 @@ class MaterialRenderList
 
 private:
 
-    RenderNodeExtraBuffer *extra_buffer;
+    RenderExtraBuffer *extra_buffer;
 
     struct RenderItem
     {
@@ -34,7 +34,7 @@ private:
         void Set(Renderable *);
     };
 
-    SortedSets<MaterialInstance *> mi_set;
+    MaterialInstanceSets mi_set;
     List<RenderItem> ri_list;
     uint ri_count;
 
diff --git a/inc/hgl/graph/RenderNode.h b/inc/hgl/graph/RenderNode.h
index 143705d9..9e42d2b7 100644
--- a/inc/hgl/graph/RenderNode.h
+++ b/inc/hgl/graph/RenderNode.h
@@ -2,12 +2,14 @@
 #define HGL_GRAPH_RENDER_NODE_INCLUDE
 
 #include<hgl/graph/VK.h>
+#include<hgl/type/SortedSets.h>
 namespace hgl
 {
     namespace graph
     {
         class Renderable;
         class Material;
+        class MaterialInstance;
         class GPUDevice;
         struct VertexInputData;
         struct IndexBufferData;
@@ -20,6 +22,8 @@ namespace hgl
         };
 
         using RenderNodeList=List<RenderNode>;
+
+        using MaterialInstanceSets=SortedSets<MaterialInstance *>;
     }//namespace graph
 }//namespace hgl
 #endif//HGL_GRAPH_RENDER_NODE_INCLUDE
diff --git a/src/SceneGraph/MaterialRenderList.cpp b/src/SceneGraph/MaterialRenderList.cpp
index ba49f66a..731c9d9e 100644
--- a/src/SceneGraph/MaterialRenderList.cpp
+++ b/src/SceneGraph/MaterialRenderList.cpp
@@ -96,23 +96,28 @@ void MaterialRenderList::End()
         Sort(rn_list,&rnc);
     }
 
-    //写入LocalToWorld数据
-    {
-        uint count=rn_list.GetCount();
+    const uint node_count=rn_list.GetCount();
 
-        if(count<=0)return;
+    if(node_count<=0)return;
 
-        if(!extra_buffer)
-            extra_buffer=new RenderNodeExtraBuffer;
+    if(!extra_buffer)
+        extra_buffer=new RenderExtraBuffer;
 
-        if(extra_buffer->node_count<count)
-            extra_buffer->NodeAlloc(device,count);
-
-        //写入数据
-        extra_buffer->WriteData(rn_list.GetData(),count);
-    }
+    if(extra_buffer->node_count<node_count)
+        extra_buffer->NodeAlloc(device,node_count);
 
     Stat();
+
+    //写入LocalToWorld数据
+    extra_buffer->WriteLocalToWorld(rn_list.GetData(),node_count);
+
+    const uint mi_count=mi_set.GetCount();
+
+    if(mi_count<=0)return;
+
+    if(extra_buffer->mi_count<mi_count)
+        extra_buffer->MIAlloc(device,mi_count,);
+    extra_buffer->WriteMaterialInstance(rn_list.GetData(),node_count,mi_set);
 }
 
 void MaterialRenderList::RenderItem::Set(Renderable *ri)
@@ -181,7 +186,7 @@ void MaterialRenderList::Bind(MaterialInstance *mi)
 {
 }
 
-bool MaterialRenderList::Bind(const VertexInputData *vid,const uint first)
+bool MaterialRenderList::Bind(const VertexInputData *vid,const uint ri_index)
 {
     //binding号都是在VertexInput::CreateVIL时连续紧密排列生成的，所以bind时first_binding写0就行了。
 
@@ -253,7 +258,7 @@ bool MaterialRenderList::Bind(const VertexInputData *vid,const uint first)
             hgl_cpy(buffer_list+count,extra_buffer->l2w_buffer,4);
 
             for(uint i=0;i<4;i++)
-                buffer_offset[count+i]=first*16;                        //mat4每列都是rgba32f，自然是16字节
+                buffer_offset[count+i]=ri_index*16;                        //mat4每列都是rgba32f，自然是16字节
 
             count+=l2w_binding_count;
         }
diff --git a/src/SceneGraph/RenderExtraBuffer.h b/src/SceneGraph/RenderExtraBuffer.h
index 8673231c..408d138b 100644
--- a/src/SceneGraph/RenderExtraBuffer.h
+++ b/src/SceneGraph/RenderExtraBuffer.h
@@ -4,7 +4,7 @@
 VK_NAMESPACE_BEGIN
 // ubo_range大致分为三档:
 //
-//  16k: Mali-T系列或更早、Mali-G71、nVidia GeForce RTX 3070 Laptop为16k
+//  16k: Mali-T系列或更早、Mali-G71为16k
 // 
 //  64k: 大部分手机与PC均为64k
 // 
@@ -24,7 +24,7 @@ VK_NAMESPACE_BEGIN
 /*
 * 渲染节点额外提供的数据
 */
-struct RenderNodeExtraBuffer
+struct RenderExtraBuffer
 {
     uint node_count;                            ///<渲染节点数量
     uint mi_count;                              ///<材质实例数量
@@ -35,32 +35,26 @@ struct RenderNodeExtraBuffer
     VBO *mi_id;
     VkBuffer mi_id_buffer;
 
-    VBO *bone_id,*bone_weight;
-    VkBuffer bone_id_buffer,bone_weight_buffer;
+//    VBO *bone_id,*bone_weight;
+//    VkBuffer bone_id_buffer,bone_weight_buffer;
 
     VBO *l2w_vbo[4];
     VkBuffer l2w_buffer[4];
 
 public:
 
-    RenderNodeExtraBuffer()
+    RenderExtraBuffer()
     {
         hgl_zero(*this);
     }
 
-    ~RenderNodeExtraBuffer()
+    ~RenderExtraBuffer()
     {
         Clear();
     }
 
-    void Clear()
+    void ClearNode()
     {
-        SAFE_CLEAR(mi_id)
-        SAFE_CLEAR(mi_data_buffer);
-
-        SAFE_CLEAR(bone_id)
-        SAFE_CLEAR(bone_weight)
-
         SAFE_CLEAR(l2w_vbo[0])
         SAFE_CLEAR(l2w_vbo[1])
         SAFE_CLEAR(l2w_vbo[2])
@@ -68,9 +62,26 @@ public:
         node_count=0;
     }
 
+    void ClearMI()
+    {
+        SAFE_CLEAR(mi_id)
+        SAFE_CLEAR(mi_data_buffer);
+        mi_count=0;
+        mi_size=0;
+    }
+
+    void Clear()
+    {
+        ClearNode();
+        ClearMI();
+
+//        SAFE_CLEAR(bone_id)
+//        SAFE_CLEAR(bone_weight)
+    }
+
     void NodeAlloc(GPUDevice *dev,const uint c)
     {
-        Clear();
+        ClearNode();
         node_count=power_to_2(c);
 
         for(uint i=0;i<4;i++)
@@ -80,11 +91,13 @@ public:
         }
     }
 
-    void MIAlloc(GPUDevice *dev,const uint c)
+    void MIAlloc(GPUDevice *dev,const uint c,const uint mis)
     {
+        ClearMI();
         if(c<=0||mi_size<=0)return;
     
         mi_count=power_to_2(c);
+        mi_size=mis;
 
         mi_id=dev->CreateVBO(VF_V1U8,mi_count);
         mi_id_buffer=mi_id->GetBuffer();
@@ -92,7 +105,7 @@ public:
         mi_data_buffer=dev->CreateUBO(mi_count*mi_size);
     }
 
-    void WriteData(RenderNode *render_node,const uint count)
+    void WriteLocalToWorld(RenderNode *render_node,const uint count)
     {
         RenderNode *rn;
         glm::vec4 *tp;
@@ -113,5 +126,39 @@ public:
             l2w_vbo[col]->Unmap();
         }
     }
-};//struct RenderNodeExtraBuffer
+
+    void WriteMaterialInstance(RenderNode *render_node,const uint count,const MaterialInstanceSets &mi_set)
+    {
+        //MaterialInstance ID
+        {
+            uint8 *tp=(uint8 *)(mi_id->Map());
+
+            for(uint i=0;i<count;i++)
+            {
+                *tp=mi_set.Find(render_node->ri->GetMaterialInstance());
+                ++tp;
+                ++render_node;
+            }
+            mi_id->Unmap();
+        }
+
+        //MaterialInstance Data
+        {
+            const uint count=mi_set.GetCount();
+
+            uint8 *tp=(uint8 *)(mi_data_buffer->Map());
+            const MaterialInstance **mi=mi_set.GetData();
+
+            for(uint i=0;i<count;i++)
+            {
+                memcpy(tp,(*mi)->GetData(),mi_size);
+    
+                ++mi;
+                tp+=mi_size;
+            }
+
+            mi_data_buffer->Unmap();
+        }
+    }
+};//struct RenderExtraBuffer
 VK_NAMESPACE_END