diff --git a/inc/hgl/graph/vulkan/VKDescriptorSets.h b/inc/hgl/graph/vulkan/VKDescriptorSets.h
index babbaf06..0a92bfcc 100644
--- a/inc/hgl/graph/vulkan/VKDescriptorSets.h
+++ b/inc/hgl/graph/vulkan/VKDescriptorSets.h
@@ -11,7 +11,7 @@ class DescriptorSets
     Device *device;
     int count;
     VkDescriptorSet *desc_set_list;
-    Map<uint32_t,int> index_by_binding;
+    const Map<uint32_t,int> *index_by_binding;
 
     VkPipelineLayout pipeline_layout;
 
@@ -19,12 +19,11 @@ private:
 
     friend class DescriptorSetLayoutCreater;
 
-    DescriptorSets(Device *dev,const int c,VkPipelineLayout pl,VkDescriptorSet *desc_set,Map<uint32_t,int> &bi)
+    DescriptorSets(Device *dev,const int c,VkPipelineLayout pl,VkDescriptorSet *desc_set,const Map<uint32_t,int> *bi):index_by_binding(bi)
     {
         device=dev;
         count=c;
         desc_set_list=desc_set;
-        index_by_binding=bi;
         pipeline_layout=pl;
     }
 
@@ -34,7 +33,7 @@ public:
 
     const uint32_t                  GetCount            ()const{return count;}
     const VkDescriptorSet *         GetDescriptorSets   ()const{return desc_set_list;}
-          VkDescriptorSet           GetDescriptorSet    (const uint32_t binding);
+          VkDescriptorSet           GetDescriptorSet    (const uint32_t binding)const;
     const VkPipelineLayout          GetPipelineLayout   ()const{return pipeline_layout;}
 
     bool UpdateUBO(const uint32_t binding,const VkDescriptorBufferInfo *buf_info);
diff --git a/src/RenderDevice/Vulkan/VKDescriptorSetLayoutCreater.cpp b/src/RenderDevice/Vulkan/VKDescriptorSetLayoutCreater.cpp
index 67229b4c..df6ce4fc 100644
--- a/src/RenderDevice/Vulkan/VKDescriptorSetLayoutCreater.cpp
+++ b/src/RenderDevice/Vulkan/VKDescriptorSetLayoutCreater.cpp
@@ -126,6 +126,6 @@ DescriptorSets *DescriptorSetLayoutCreater::Create()
         return(nullptr);
     }
 
-    return(new DescriptorSets(device,count,pipeline_layout,desc_set,index_by_binding));
+    return(new DescriptorSets(device,count,pipeline_layout,desc_set,&index_by_binding));
 }
 VK_NAMESPACE_END
\ No newline at end of file
diff --git a/src/RenderDevice/Vulkan/VKDescriptorSets.cpp b/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
index 98533376..6c0dff51 100644
--- a/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
+++ b/src/RenderDevice/Vulkan/VKDescriptorSets.cpp
@@ -2,11 +2,11 @@
 #include<hgl/graph/vulkan/VKDevice.h>
 
 VK_NAMESPACE_BEGIN
-VkDescriptorSet DescriptorSets::GetDescriptorSet(const uint32_t binding)
+VkDescriptorSet DescriptorSets::GetDescriptorSet(const uint32_t binding)const
 {
     int index;
 
-    if(!index_by_binding.Get(binding,index))
+    if(!index_by_binding->Get(binding,index))
         return(nullptr);
 
     return desc_set_list[index];