diff --git a/utils/filemgmt_libn/src/n_class.cpp b/utils/filemgmt_libn/src/n_class.cpp
index 16828cab2c07f3d919f5c510f36c7c888422c5f9..d60f1752502921977fc6ee3d318e24b72dedcdc3 100644
--- a/utils/filemgmt_libn/src/n_class.cpp
+++ b/utils/filemgmt_libn/src/n_class.cpp
@@ -86,6 +86,7 @@ void NClass::CleanClass(void *arg)
             HILOGE("Cannot del ref class constructor %{public}s because of %{public}d", it->first.c_str(), res);
         }
     }
+    nClass.exClassMap.clear();
 }
 
 napi_value NClass::InstantiateClass(napi_env env, const string& className, const vector<napi_value>& args)