diff --git a/inc/hgl/graph/VKMaterial.h b/inc/hgl/graph/VKMaterial.h
index 8785dde6..70bdd7bc 100644
--- a/inc/hgl/graph/VKMaterial.h
+++ b/inc/hgl/graph/VKMaterial.h
@@ -71,19 +71,25 @@ public:
 public:
 
     const   uint32_t                            GetMICount              ()const{return mi_count;}
-    const   uint32_t                            GetMISize               ()const{return mi_size;}
+    const   uint32_t                            GetMISize               ()const{return data->mi_size;}
     const   void *                              GetMIData               ()const{return data->mi_data;}
 
     template<typename T>
-            T *                                 GetMIData               (const uint32_t index)const{return data->mi_data?(T *)(data->mi_data+index*mi_size):nullptr;}
+            T *                                 GetMIData               (const uint32_t index)const
+    {
+        if(!data->mi_data)return(nullptr);
+        if(index>=mi_count)return(nullptr);
+
+        return data->mi_data+index*mi_size;
+    }
 
     template<typename T>
-            bool                                WriteMIData             (const uint32_t index,const T *data)
+            bool                                WriteMIData             (const uint32_t index,const T *write_data)
     {
         if(!data->mi_data)return(false);
         if(index>=mi_count)return(false);
 
-        memcpy(mi_data+index*mi_size,data,mi_size);
+        memcpy(data->mi_data+index*mi_size,write_data,data->mi_size);
         return(true);
     }
 
diff --git a/src/SceneGraph/Vulkan/VKDeviceCreater.cpp b/src/SceneGraph/Vulkan/VKDeviceCreater.cpp
index dc4a20b8..32f00e87 100644
--- a/src/SceneGraph/Vulkan/VKDeviceCreater.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceCreater.cpp
@@ -62,7 +62,7 @@ namespace
 
 //        FEATURE_COPY(imageCubeArray);
 //        FEATURE_COPY(fullDrawIndexUint32);
-//        FEATURE_COPY(wideLines)
+        FEATURE_COPY(wideLines)
 //        FEATURE_COPY(largePoints)
 
         #undef FEATURE_COPY
diff --git a/src/SceneGraph/Vulkan/VKDeviceMaterial.cpp b/src/SceneGraph/Vulkan/VKDeviceMaterial.cpp
index f1aedfa3..cd038463 100644
--- a/src/SceneGraph/Vulkan/VKDeviceMaterial.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceMaterial.cpp
@@ -1,4 +1,4 @@
-#include<hgl/graph/VKDevice.h>
+#include<hgl/graph/VKDevice.h>
 #include<hgl/graph/VKMaterial.h>
 #include<hgl/graph/VKMaterialDescriptorManager.h>
 #include<hgl/graph/VKMaterialParameters.h>
@@ -119,15 +119,20 @@ Material *GPUDevice::CreateMaterial(const UTF8String &mtl_name,ShaderModuleMap *
 
     const VkDeviceSize ubo_range=this->GetUBORange();
 
+    //手机一般ubo_range为16k,PC独显一般为64k
+    //intel 核显随显存基本无限制
+    //我们使用uint8类型在vertex input中保存MaterialInstance ID，表示范围0-255。
+    //所以MaterialInstance结构容量在手机上尽量不要超过64字节，在PC上不要超过256字节，当然intel核显无所谓
+
     if(desc_manager->hasSet(DescriptorSetType::PerMaterial))
     {
-        data->mi_data=new uint8[ubo_range];
         data->mi_size
+        data->mi_data=new uint8[data->mi_size*256];
     }
     else
     {
-        data->mi_data=nullptr;
         data->mi_size=0;
+        data->mi_data=nullptr;
     }
 
     return(new Material(data));
diff --git a/src/SceneGraph/Vulkan/VKMaterial.cpp b/src/SceneGraph/Vulkan/VKMaterial.cpp
index d86c9de1..10859bed 100644
--- a/src/SceneGraph/Vulkan/VKMaterial.cpp
+++ b/src/SceneGraph/Vulkan/VKMaterial.cpp
@@ -18,7 +18,6 @@ MaterialData::~MaterialData()
 
 Material::Material(MaterialData *md):data(md)
 {
-    mi_size=0;
     mi_count=0;
 }