diff --git a/doc/design/cluster_train/data_dispatch.md b/doc/design/cluster_train/data_dispatch.md
index e7798b24f630f7fb63c954e17d66d32bf9685626..9f7167498ce50e70b5ae6ac6a7c67e5fd0a655ca 100644
--- a/doc/design/cluster_train/data_dispatch.md
+++ b/doc/design/cluster_train/data_dispatch.md
@@ -19,6 +19,7 @@
 
 - 无论是从[PFSClient](../file_manager/README.md)的角度，还是从[Pod](https://kubernetes.io/docs/concepts/workloads/pods/pod/)中运行任务的角度，统一用`/pfs/$DATACENTER/home/$USER`来访问用户自己的数据。  
 - `/pfs/$DATACENTER/common`下存放公共数据集合
+	- 做只读挂载 
 
 <div style="align: center">
 <img src="src/file_storage.png" width="700" align=center/>
@@ -141,9 +142,6 @@ endpoint=datacenter2.paddlepaddle.org
 ## TODO
 ### 文件访问的权限
 控制用户权限
-
-- `/pfs/$DATACENTER/common`数据集合只读不能写 
-	- 现在mount到本地以后有读写权限
 - 用户可以把自己的数据分享给别人
 
 ### 文件访问方式
diff --git a/doc/design/cluster_train/src/file_storage.graffle b/doc/design/cluster_train/src/file_storage.graffle
index 5331f407f7ee77fca263be24eb83ed1d44ca2bd4..50a17e70fa255495337c529a3bf12a5c0024a5be 100644
Binary files a/doc/design/cluster_train/src/file_storage.graffle and b/doc/design/cluster_train/src/file_storage.graffle differ
diff --git a/doc/design/cluster_train/src/file_storage.png b/doc/design/cluster_train/src/file_storage.png
index d88af97e034aae6fc09a728619e2a56fe8481f80..fccb4e3e7e738224c7f1584326bd5f351ce799aa 100644
Binary files a/doc/design/cluster_train/src/file_storage.png and b/doc/design/cluster_train/src/file_storage.png differ