diff --git a/lib/common/core/app_config_helper.dart b/lib/common/core/app_config_helper.dart
index 45df42b..d088356 100644
--- a/lib/common/core/app_config_helper.dart
+++ b/lib/common/core/app_config_helper.dart
@@ -1,11 +1,9 @@
-import 'dart:ffi';
 import 'dart:io';
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:package_info_plus/package_info_plus.dart';
-import 'package:wow_english/common/core/sp_const.dart';
 import 'package:wow_english/common/core/user_util.dart';
 
 import '../../models/app_config_entity.dart';
@@ -14,6 +12,8 @@ import '../request/dao/system_dao.dart';
 
 class AppConfigHelper {
 
+  static const String _prefsKeyAgreementAccepted = "privacy_agreement_accepted";
+
   static AppConfigEntity? configEntityEntity;
 
   static String _versionCode = '';
@@ -56,15 +56,15 @@ class AppConfigHelper {
   }
 
   static void saveAgreementAccepted(bool accepted) {
-    SpUtil.getInstance().setData(SpConst.prefsKeyAgreementAccepted, accepted);
+    SpUtil.getInstance().setData(_prefsKeyAgreementAccepted, accepted);
   }
 
   static bool getAgreementAccepted() {
-    return SpUtil.getInstance().get<bool>(SpConst.prefsKeyAgreementAccepted) ?? false;
+    return SpUtil.getInstance().get<bool>(_prefsKeyAgreementAccepted) ?? false;
   }
 
   static void _clearUserData() {
-    SpUtil.getInstance().remove(SpConst.prefsKeyAgreementAccepted);
+    SpUtil.getInstance().remove(_prefsKeyAgreementAccepted);
   }
 
   static void exitApp() {
diff --git a/lib/common/core/sp_const.dart b/lib/common/core/sp_const.dart
deleted file mode 100644
index 547e52a..0000000
--- a/lib/common/core/sp_const.dart
+++ /dev/null
@@ -1,5 +0,0 @@
-class SpConst {
-  static const String prefsKeyUserInfo = "key_user_info";
-
-  static const String prefsKeyAgreementAccepted = "privacy_agreement_accepted";
-}
diff --git a/lib/common/core/user_util.dart b/lib/common/core/user_util.dart
index 40a227e..fea43a2 100644
--- a/lib/common/core/user_util.dart
+++ b/lib/common/core/user_util.dart
@@ -2,7 +2,6 @@ import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
 import 'package:umeng_common_sdk/umeng_common_sdk.dart';
-import 'package:wow_english/common/core/sp_const.dart';
 import 'package:wow_english/models/user_entity.dart';
 import 'package:wow_english/route/route.dart';
 import 'package:wow_english/utils/sp_util.dart';
@@ -10,6 +9,9 @@ import 'package:wow_english/utils/sp_util.dart';
 import '../../utils/audio_player_util.dart';
 
 class UserUtil {
+
+  static const String _prefsKeyUserInfo = "key_user_info";
+
   static UserEntity? _userEntity;
 
   static void saveUser(UserEntity? user) {
@@ -41,16 +43,16 @@ class UserUtil {
   }
 
   static void _saveUserJson(String userJson) {
-    SpUtil.getInstance().setData(SpConst.prefsKeyUserInfo, userJson);
+    SpUtil.getInstance().setData(_prefsKeyUserInfo, userJson);
   }
 
   static String? _getUserJson() {
-    return SpUtil.getInstance().get<String>(SpConst.prefsKeyUserInfo);
+    return SpUtil.getInstance().get<String>(_prefsKeyUserInfo);
   }
 
   static void _clearUserData() {
     _userEntity = null;
-    SpUtil.getInstance().remove(SpConst.prefsKeyUserInfo);
+    SpUtil.getInstance().remove(_prefsKeyUserInfo);
   }
 
   static void logout([bool showPasswordLoginPage = false]) {