diff --git a/util/native_module_util.cpp b/util/native_module_util.cpp
index b866bf7534a8933810483eff83bbd17d334c5758..16a9f6c791347098e761c8b7ef227475746a8810 100755
--- a/util/native_module_util.cpp
+++ b/util/native_module_util.cpp
@@ -392,7 +392,7 @@ namespace OHOS::Util {
         return retVal;
     }
 
-    static bool CheckEncodingFormat(std::string &encoding)
+    static bool CheckEncodingFormat(const std::string &encoding)
     {
         const std::string conventFormat("utf8-t,UTF-8,gbk,GBK,GB2312,gb2312,GB18030,gb18030");
         if (conventFormat.find(encoding.c_str()) != conventFormat.npos) {