diff --git a/example/Basic/auto_instance.cpp b/example/Basic/auto_instance.cpp
index 86a33b99..5aa07fe6 100644
--- a/example/Basic/auto_instance.cpp
+++ b/example/Basic/auto_instance.cpp
@@ -24,7 +24,8 @@ constexpr float position_data[VERTEX_COUNT*2]=
 };
 
 constexpr uint8 color_data[VERTEX_COUNT][4]=
-{   {255,0,0,255},
+{
+    {255,0,0,255},
     {0,255,0,255},
     {0,0,255,255}
 };
diff --git a/inc/hgl/graph/PrimitiveCreater.h b/inc/hgl/graph/PrimitiveCreater.h
index 7f5780c8..73b5d325 100644
--- a/inc/hgl/graph/PrimitiveCreater.h
+++ b/inc/hgl/graph/PrimitiveCreater.h
@@ -15,14 +15,6 @@ namespace hgl
          */
         class PrimitiveCreater
         {
-            struct PrimitiveVertexBuffer
-            {
-                VBO *           vbo;
-                void *          map_data;
-            };//struct PrimitiveVertexBuffer
-
-            using PVBMap=ObjectMap<AnsiString,PrimitiveVertexBuffer>;
-
         protected:
 
             GPUDevice *device;
@@ -40,11 +32,11 @@ namespace hgl
 
             IndexBuffer *       ibo;
             void *              ibo_map;
-            PVBMap              vbo_map;
+            VBOAccessMap        vbo_map;
 
         protected:
 
-            PrimitiveVertexBuffer *AcquirePVB(const AnsiString &,const void *data);                                     ///<请求一个顶点属性数据区
+            bool AcquirePVB(VBOAccessData *,const AnsiString &,const void *data);                                     ///<请求一个顶点属性数据区
 
             void ClearAllData();
 
@@ -64,12 +56,11 @@ namespace hgl
                         if(format!=T::GetVulkanFormat())
                             return(nullptr);
 
-                        PrimitiveVertexBuffer *pvb=this->AcquirePVB(name,nullptr);
-
-                        if(!pvb)
+                        VBOAccessData vad;
+                        if(!this->AcquirePVB(&vad,name,nullptr))
                             return(nullptr);
 
-                        T *access=T::Create(vertices_number,pvb->map_data);
+                        T *access=T::Create(vertices_number,vad.map_ptr);
 
                         access->Begin();
 
diff --git a/inc/hgl/graph/VKVertexAttribBuffer.h b/inc/hgl/graph/VKVertexAttribBuffer.h
index 7e320381..e57bddc3 100644
--- a/inc/hgl/graph/VKVertexAttribBuffer.h
+++ b/inc/hgl/graph/VKVertexAttribBuffer.h
@@ -43,6 +43,8 @@ namespace hgl
             VkDeviceSize offset;
             VkDeviceSize size;
 
+            void *map_ptr;
+
         public:
 
             CompOperatorMemcmp(const VBOAccessData &);
diff --git a/src/SceneGraph/InlineGeometry.cpp b/src/SceneGraph/InlineGeometry.cpp
index 644c679a..cb55e2e9 100644
--- a/src/SceneGraph/InlineGeometry.cpp
+++ b/src/SceneGraph/InlineGeometry.cpp
@@ -223,7 +223,7 @@ namespace hgl
 
                 if(!rc.Init(4,8))
                     return(nullptr);
-            
+
                 rc.WriteVBO(VAN::Position,xy_vertices,sizeof(xy_vertices));
 
                 {
diff --git a/src/SceneGraph/PrimitiveCreater.cpp b/src/SceneGraph/PrimitiveCreater.cpp
index 6676523e..12bd6617 100644
--- a/src/SceneGraph/PrimitiveCreater.cpp
+++ b/src/SceneGraph/PrimitiveCreater.cpp
@@ -58,7 +58,6 @@ namespace hgl
 
                 if(vdm)
                 {
-                    
                 }
                 else
                 {
@@ -69,24 +68,10 @@ namespace hgl
                         if(!IsIndexType(it))
                             return(false);
                     }
-                    else if(it==IndexType::U8)
-                    {
-                        if(!phy_device->SupportU8Index()||vertex_count>0xFF)
-                            return(false);
-                    }
-                    else if(it==IndexType::U16)
-                    {
-                        if(vertex_count>0xFFFF)
-                            return(false);
-                    }
-                    else if(it==IndexType::U32)
-                    {
-                        if(!phy_device->SupportU32Index())
-                            return(false);
-                    }
                     else
                     {
-                        return(false);
+                        if(!device->CheckIndexType(it,vertex_count))
+                            return(false);
                     }
 
                     ibo=device->CreateIBO(it,index_count);
@@ -100,33 +85,30 @@ namespace hgl
             return(true);
         }
 
-        PrimitiveCreater::PrimitiveVertexBuffer *PrimitiveCreater::AcquirePVB(const AnsiString &name,const void *data)
+        bool PrimitiveCreater::AcquirePVB(VBOAccessData *vad,const AnsiString &name,const void *data)
         {
-            if(!vil)return(nullptr);
-            if(name.IsEmpty())return(nullptr);
+            if(!vad)return(false);
+            if(!vil)return(false);
+            if(name.IsEmpty())return(false);
             
             const VertexInputFormat *vif=vil->GetConfig(name);
 
             if(!vif)
-                return(nullptr);
+                return(false);
 
-            PrimitiveVertexBuffer *pvb;
+            if(vbo_map.Get(name,*vad))
+                return true;
 
-            if(vbo_map.Get(name,pvb))
-                return pvb;
-
-            pvb=new PrimitiveVertexBuffer;
-
-            pvb->vbo    =db->CreateVBO(vif->format,vertices_number,data);
+            vad->vbo    =db->CreateVBO(vif->format,vertices_number,data);
 
             if(!data)
-                pvb->map_data=pvb->vbo->Map();
+                vad->map_ptr=vad->vbo->Map();
             else
-                pvb->map_data=nullptr;
+                vad->map_ptr=nullptr;
 
-            vbo_map.Add(name,pvb);
+            vbo_map.Add(name,*vad);
 
-            return pvb;
+            return true;
         }
 
         bool PrimitiveCreater::WriteVBO(const AnsiString &name,const void *data,const uint32_t bytes)
@@ -144,7 +126,9 @@ namespace hgl
             if(vif->stride*vertices_number!=bytes)
                 return(false);
 
-            return AcquirePVB(name,data);
+            VBOAccessData vad;
+
+            return AcquirePVB(&vad,name,data);
         }
 
         void PrimitiveCreater::ClearAllData()
@@ -154,10 +138,10 @@ namespace hgl
                 const auto *sp=vbo_map.GetDataList();
                 for(uint i=0;i<vbo_map.GetCount();i++)
                 {
-                    if((*sp)->value->vbo)
+                    if((*sp)->value.vbo)
                     {
-                        (*sp)->value->vbo->Unmap();
-                        delete (*sp)->value->vbo;
+                        (*sp)->value.vbo->Unmap();
+                        delete (*sp)->value.vbo;
                     }
                 
                     ++sp;
@@ -184,12 +168,12 @@ namespace hgl
             const auto *sp=vbo_map.GetDataList();
             for(uint i=0;i<si_count;i++)
             {
-                if((*sp)->value->vbo)
+                if((*sp)->value.vbo)
                 {
-                    if((*sp)->value->map_data)
-                        (*sp)->value->vbo->Unmap();
+                    if((*sp)->value.map_ptr)
+                        (*sp)->value.vbo->Unmap();
 
-                    primitive->Set((*sp)->key,(*sp)->value->vbo);
+                    primitive->Set((*sp)->key,(*sp)->value.vbo);
                 }
                 else
                 {