diff --git a/interfaces/kits/js/file_share/grant_uri_permission.cpp b/interfaces/kits/js/file_share/grant_uri_permission.cpp
index 543ddb4c5cc641a7c9db8309056ec79e25872179..b287bf0b1c6463ca80b0717eb5df919cecf698c4 100644
--- a/interfaces/kits/js/file_share/grant_uri_permission.cpp
+++ b/interfaces/kits/js/file_share/grant_uri_permission.cpp
@@ -61,7 +61,7 @@ namespace ModuleFileShare {
             }
         }
         if (count == MEET_COUNT) {
-            str = str.substr(0, index);
+            str.resize(index);
         }
         return str;
     }