diff --git a/source/state/level.py b/source/state/level.py
index f9ed135..61c7833 100644
--- a/source/state/level.py
+++ b/source/state/level.py
@@ -1,5 +1,4 @@
 import os
-import json
 import pygame as pg
 import random
 import logging
@@ -31,15 +30,6 @@ class Level(tool.State):
         self.setupBackground()
         self.initState()
 
-    def saveUserData(self):
-        with open(c.USERDATA_PATH, "w") as f:
-            userdata = {}
-            for i in self.game_info:
-                if i in c.INIT_USERDATA:
-                    userdata[i] = self.game_info[i]
-            dataToSave = json.dumps(userdata, sort_keys=True, indent=4)
-            f.write(dataToSave)
-
     def loadMap(self):
         # 冒险模式
         if self.game_info[c.GAME_MODE] == c.MODE_ADVENTURE:
diff --git a/source/state/mainmenu.py b/source/state/mainmenu.py
index 5eb9ae1..57702cc 100644
--- a/source/state/mainmenu.py
+++ b/source/state/mainmenu.py
@@ -1,6 +1,5 @@
 import pygame as pg
 import os
-import json
 from .. import tool
 from .. import constants as c
 
@@ -25,15 +24,6 @@ class Menu(tool.State):
         for i in c.SOUNDS:
             i.set_volume(self.game_info[c.SOUND_VOLUME])
 
-    def saveUserData(self):
-        with open(c.USERDATA_PATH, "w") as f:
-            userdata = {}
-            for i in self.game_info:
-                if i in c.INIT_USERDATA:
-                    userdata[i] = self.game_info[i]
-            dataToSave = json.dumps(userdata, sort_keys=True, indent=4)
-            f.write(dataToSave)
-
     def setupBackground(self):
         frame_rect = (80, 0, 800, 600)
         # 1、形参中加单星号，即f(*x)则表示x为元组，所有对x的操作都应将x视为元组类型进行。
diff --git a/source/tool.py b/source/tool.py
index a50b8e6..8ef40dd 100755
--- a/source/tool.py
+++ b/source/tool.py
@@ -37,6 +37,16 @@ class State():
         else:
             return False
 
+    # 工具：用户数据保存函数
+    def saveUserData(self):
+        with open(c.USERDATA_PATH, "w") as f:
+            userdata = {}
+            for i in self.game_info:
+                if i in c.INIT_USERDATA:
+                    userdata[i] = self.game_info[i]
+            data_to_save = json.dumps(userdata, sort_keys=True, indent=4)
+            f.write(data_to_save)
+
 # control this game. do event loops
 class Control():
     def __init__(self):