diff --git a/collection/uni-id-users/collection.json b/collection/uni-id-users/collection.json
index 073c8f2..5fb09ad 100644
--- a/collection/uni-id-users/collection.json
+++ b/collection/uni-id-users/collection.json
@@ -111,7 +111,7 @@
 		"trim":"both"
       },
 	  "department_id": {
-	    "bsonType": "string",
+	    "bsonType": "array",
 	    "description": "部门ID",
 	    "title": "部门",
 	    "enumType": "tree",
@@ -371,6 +371,16 @@
         }],
         "MgoIsUnique": false
       }
-    }
+    },
+	{
+	  "IndexName": "department",
+	  "MgoKeySchema": {
+	    "MgoIndexKeys": [{
+	      "Name": "department_id",
+	      "Direction": "1"
+	    }],
+	    "MgoIsUnique": false
+	  }
+	}
   ]
 }