diff --git a/interfaces/kits/js/src/mod_fs/properties/read_text.cpp b/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
index 7354353bfb05b3e17c9d23146fe5a46c13034818..18659d1c49808a1fe75f7e39fc7dd456529260a1 100755
--- a/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
+++ b/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
@@ -198,7 +198,7 @@ napi_value ReadText::Sync(napi_env env, napi_callback_info info)
         return nullptr;
     }
 
-    return NVal::CreateUTF8String(env, buffer.c_str(), buffer.size()).val_;
+    return NVal::CreateUTF8String(env, buffer.c_str(), readRet).val_;
 }
 
 napi_value ReadText::Async(napi_env env, napi_callback_info info)