diff --git a/interfaces/kits/js/src/mod_fs/class_watcher/watcher_entity.cpp b/interfaces/kits/js/src/mod_fs/class_watcher/watcher_entity.cpp
index 2cdb84a7eb63b19fc78df5a7a54d675f58989aea..4a336e9614518a0790d100e9af98287c76d781db 100644
--- a/interfaces/kits/js/src/mod_fs/class_watcher/watcher_entity.cpp
+++ b/interfaces/kits/js/src/mod_fs/class_watcher/watcher_entity.cpp
@@ -20,6 +20,7 @@
 #include <poll.h>
 #include <sys/eventfd.h>
 #include <unistd.h>
+#include <filesystem>
 
 #include "filemgmt_libhilog.h"
 #include "uv.h"
@@ -311,7 +312,9 @@ void FileWatcher::NotifyEvent(const struct inotify_event *event, WatcherCallback
             continue;
         }
         if (event->len > 0) {
-            fileName += "/" + string(event->name);
+            std::filesystem::path base = fileName;
+            std::filesystem::path file = string(event->name);
+            fileName = base / file;
         }
         callback(iter->env, iter->nRef, fileName, event->mask & IN_ALL_EVENTS, event->cookie);
     }