diff --git a/maubot_llmplus/aibot.py b/maubot_llmplus/aibot.py
index e22b124..8177741 100644
--- a/maubot_llmplus/aibot.py
+++ b/maubot_llmplus/aibot.py
@@ -18,6 +18,7 @@ from maubot_llmplus.thrid_platform import OpenAi, Anthropic
 
 
 class Config(BaseProxyConfig):
+
     def do_update(self, helper: ConfigUpdateHelper) -> None:
         helper.copy("allowed_users")
         helper.copy("use_platform")
@@ -27,6 +28,7 @@ class Config(BaseProxyConfig):
         helper.copy("system_prompt")
         helper.copy("platforms")
         helper.copy("additional_prompt")
+        super._cur_model = self['platforms'][self['use_platform']]['model']
 
 
 class AiBotPlugin(AbsExtraConfigPlugin):
@@ -182,7 +184,7 @@ class AiBotPlugin(AbsExtraConfigPlugin):
             models = platform.list_models()
             if f"- {arg_elements[1]}" in models:
                 self.log.debug(f"switch model: {arg_elements[1]}")
-                self.model = arg_elements[1]
+                self.config._cur_model = arg_elements[1]
                 await event.react("✅")
             else:
                 await event.reply("not found valid model")
diff --git a/maubot_llmplus/platforms.py b/maubot_llmplus/platforms.py
index e907a33..e444378 100644
--- a/maubot_llmplus/platforms.py
+++ b/maubot_llmplus/platforms.py
@@ -40,7 +40,7 @@ class Platform:
         self.http = http
         self.config = config['platforms'][self.get_type()]
         self.url = self.config['url']
-        self.model = self.config['model']
+        self.model = config._cur_model
         self.max_words = self.config['max_words']
         self.api_key = self.config['api_key']
         self.max_context_messages = self.config['max_context_messages']
diff --git a/maubot_llmplus/plugin.py b/maubot_llmplus/plugin.py
index a13a762..0c1d120 100644
--- a/maubot_llmplus/plugin.py
+++ b/maubot_llmplus/plugin.py
@@ -5,18 +5,13 @@ class AbsExtraConfigPlugin(Plugin):
     default_username: str
     user_id: str
 
-    model: str;
-
     async def start(self) -> None:
         await super().start()
         self.default_username = await self.client.get_displayname(self.client.mxid)
         self.user_id = self.client.parse_user_id(self.client.mxid)[0]
-        self.model = self.config['platforms'][self.config['use_platform']]['model']
+
 
     def get_bot_name(self) -> str:
         return self.config['name'] or \
             self.default_username or \
             self.user_id
-
-    def get_use_model(self) -> str:
-        return self.model