diff --git a/inc/hgl/graph/VKArrayBuffer.h b/inc/hgl/graph/VKArrayBuffer.h
index 9aafb12a..e40bdd74 100644
--- a/inc/hgl/graph/VKArrayBuffer.h
+++ b/inc/hgl/graph/VKArrayBuffer.h
@@ -25,16 +25,16 @@ namespace hgl
 
             VKMemoryAllocator *vk_ma;
 
-            uint32_t ubo_offset_alignment;
+            uint32_t offset_alignment;
 
             Collection *coll;
 
         public:
         
-            GPUArrayBuffer(GPUDevice *dev,VkBufferUsageFlags flags,const uint il);
+            GPUArrayBuffer(GPUDevice *dev,VkBufferUsageFlags flags,const uint il,VkDescriptorType dt);
             virtual ~GPUArrayBuffer();
 
-            const uint32_t  GetOffsetAlignment()const{return ubo_offset_alignment;}
+            const uint32_t  GetOffsetAlignment()const{return offset_alignment;}
             const uint32_t  GetUnitSize()const;
             DeviceBuffer *  GetBuffer();
 
diff --git a/inc/hgl/graph/VKDevice.h b/inc/hgl/graph/VKDevice.h
index a3904473..9b8e20ee 100644
--- a/inc/hgl/graph/VKDevice.h
+++ b/inc/hgl/graph/VKDevice.h
@@ -140,6 +140,7 @@ public: //Buffer相关
     IndexBuffer *   CreateIBO32 (                 uint32_t count,                     SharingMode sm=SharingMode::Exclusive){return CreateIBO(IndexType::U32, count,nullptr,sm);}
 
     const VkDeviceSize GetUBOAlign();
+    const VkDeviceSize GetSSBOAlign();
 
 #define CREATE_BUFFER_OBJECT(LargeName,type)    DeviceBuffer *Create##LargeName(                   VkDeviceSize size,void *data,  SharingMode sm=SharingMode::Exclusive)  {return CreateBuffer(VK_BUFFER_USAGE_##type##_BUFFER_BIT,size ,size,data,      sm);} \
                                                 DeviceBuffer *Create##LargeName(                   VkDeviceSize size,             SharingMode sm=SharingMode::Exclusive)  {return CreateBuffer(VK_BUFFER_USAGE_##type##_BUFFER_BIT,size ,size,nullptr,   sm);} \
diff --git a/src/SceneGraph/Vulkan/VKArrayBuffer.cpp b/src/SceneGraph/Vulkan/VKArrayBuffer.cpp
index 7eadb3dc..093254be 100644
--- a/src/SceneGraph/Vulkan/VKArrayBuffer.cpp
+++ b/src/SceneGraph/Vulkan/VKArrayBuffer.cpp
@@ -8,15 +8,23 @@ namespace hgl
 {
     namespace graph
     {
-        GPUArrayBuffer::GPUArrayBuffer(GPUDevice *dev,VkBufferUsageFlags flags,const uint il)
+        GPUArrayBuffer::GPUArrayBuffer(GPUDevice *dev,VkBufferUsageFlags flags,const uint il,VkDescriptorType dt)
         {
             device=dev;
             buffer_usage_flags=flags;
             item_length=il;
 
-            ubo_offset_alignment=device->GetUBOAlign();
+            if(dt==VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
+             ||dt==VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC)
+                offset_alignment=device->GetUBOAlign();
+            else
+            if(dt==VK_DESCRIPTOR_TYPE_STORAGE_BUFFER
+             ||dt==VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC)
+                offset_alignment=device->GetSSBOAlign();
+            else
+                offset_alignment=0;
 
-            const uint32_t unit_size=hgl_align<uint32_t>(item_length,ubo_offset_alignment);
+            const uint32_t unit_size=hgl_align<uint32_t>(item_length,offset_alignment);
 
             vk_ma=new VKMemoryAllocator(device,buffer_usage_flags,unit_size);     // construct function is going to set AllocUnitSize by minUniformOffsetAlignment
             MemoryBlock *mb=new MemoryBlock(vk_ma);
diff --git a/src/SceneGraph/Vulkan/VKDeviceBuffer.cpp b/src/SceneGraph/Vulkan/VKDeviceBuffer.cpp
index 978a8b64..5e53feaf 100644
--- a/src/SceneGraph/Vulkan/VKDeviceBuffer.cpp
+++ b/src/SceneGraph/Vulkan/VKDeviceBuffer.cpp
@@ -9,6 +9,11 @@ const VkDeviceSize GPUDevice::GetUBOAlign()
     return attr->physical_device->GetUBOAlign();
 }
 
+const VkDeviceSize GPUDevice::GetSSBOAlign()
+{
+    return attr->physical_device->GetSSBOAlign();
+}
+
 bool GPUDevice::CreateBuffer(DeviceBufferData *buf,VkBufferUsageFlags buf_usage,VkDeviceSize range,VkDeviceSize size,const void *data,SharingMode sharing_mode)
 {
     BufferCreateInfo buf_info;