diff --git a/nonebot_plugin_marshoai/config.py b/nonebot_plugin_marshoai/config.py
index 6bf55237..1e0ec207 100644
--- a/nonebot_plugin_marshoai/config.py
+++ b/nonebot_plugin_marshoai/config.py
@@ -1,4 +1,3 @@
-import shutil
 from io import StringIO
 from pathlib import Path
 
@@ -81,15 +80,15 @@ destination_folder = Path("config/marshoai/")
 destination_file = destination_folder / "config.yaml"
 
 
-def dump_config_to_yaml(config: ConfigModel):
-    return yaml_.dump(config.model_dump(), allow_unicode=True, default_flow_style=False)
+def dump_config_to_yaml(cfg: ConfigModel):
+    return yaml_.dump(cfg.model_dump(), allow_unicode=True, default_flow_style=False)
 
 
-def write_default_config(destination_file):
+def write_default_config(dest_file):
     """
     写入默认配置
     """
-    with open(destination_file, "w", encoding="utf-8") as f:
+    with open(dest_file, "w", encoding="utf-8") as f:
         with StringIO(dump_config_to_yaml(ConfigModel())) as f2:
             f.write(f2.read())
 
@@ -110,17 +109,17 @@ def check_yaml_is_changed():
         return True
 
 
-def merge_configs(old_config, new_config):
+def merge_configs(existing_cfg, new_cfg):
     """
     合并配置文件
     """
-    for key, value in new_config.items():
-        if key in old_config:
+    for key, value in new_cfg.items():
+        if key in existing_cfg:
             continue
         else:
             logger.info(f"新增配置项: {key} = {value}")
-            old_config[key] = value
-    return old_config
+            existing_cfg[key] = value
+    return existing_cfg
 
 
 config: ConfigModel = get_plugin_config(ConfigModel)
diff --git a/nonebot_plugin_marshoai/instances.py b/nonebot_plugin_marshoai/instances.py
index 3120c6e4..d5aaf709 100644
--- a/nonebot_plugin_marshoai/instances.py
+++ b/nonebot_plugin_marshoai/instances.py
@@ -1,6 +1,4 @@
 # Marsho 的类实例以及全局变量
-from azure.ai.inference.aio import ChatCompletionsClient
-from azure.core.credentials import AzureKeyCredential
 from nonebot import get_driver
 from openai import AsyncOpenAI
 
diff --git a/nonebot_plugin_marshoai/marsho.py b/nonebot_plugin_marshoai/marsho.py
index 33a74c4f..83338457 100644
--- a/nonebot_plugin_marshoai/marsho.py
+++ b/nonebot_plugin_marshoai/marsho.py
@@ -2,7 +2,6 @@ import contextlib
 import traceback
 from typing import Optional
 
-import openai
 from arclet.alconna import Alconna, AllParam, Args
 from azure.ai.inference.models import (
     AssistantMessage,
@@ -18,10 +17,11 @@ from nonebot.adapters import Bot, Event, Message
 from nonebot.matcher import Matcher
 from nonebot.params import CommandArg
 from nonebot.permission import SUPERUSER
-from nonebot.rule import Rule, to_me
+from nonebot.rule import to_me
 from nonebot.typing import T_State
 from nonebot_plugin_alconna import MsgTarget, UniMessage, UniMsg, on_alconna
 
+from .constants import INTRODUCTION, OPENAI_NEW_MODELS, SUPPORT_IMAGE_MODELS
 from .hooks import *
 from .instances import *
 from .metadata import metadata
diff --git a/nonebot_plugin_marshoai/models.py b/nonebot_plugin_marshoai/models.py
index 85b1c08c..47f02c85 100755
--- a/nonebot_plugin_marshoai/models.py
+++ b/nonebot_plugin_marshoai/models.py
@@ -9,7 +9,6 @@ import traceback
 from nonebot import logger
 
 from .config import config
-from .util import *
 
 
 class MarshoContext:
diff --git a/nonebot_plugin_marshoai/util.py b/nonebot_plugin_marshoai/util.py
index dca0b16e..bceef64a 100755
--- a/nonebot_plugin_marshoai/util.py
+++ b/nonebot_plugin_marshoai/util.py
@@ -21,12 +21,12 @@ from zhDateTime import DateTime
 
 from ._types import DeveloperMessage
 from .config import config
-from .constants import *
+from .constants import CODE_BLOCK_PATTERN, IMG_LATEX_PATTERN, OPENAI_NEW_MODELS
 from .deal_latex import ConvertLatex
 
 nickname_json = None  # 记录昵称
 praises_json = None  # 记录夸赞名单
-loaded_target_list = []  # 记录已恢复备份的上下文的列表
+loaded_target_list: List[str] = []  # 记录已恢复备份的上下文的列表
 
 NOT_GIVEN = NotGiven()
 
@@ -219,7 +219,7 @@ async def get_nicknames():
         try:
             async with aiofiles.open(filename, "r", encoding="utf-8") as f:
                 nickname_json = json.loads(await f.read())
-        except Exception:
+        except (json.JSONDecodeError, FileNotFoundError):
             nickname_json = {}
     return nickname_json
 
@@ -249,7 +249,7 @@ async def refresh_nickname_json():
             store.get_plugin_data_file("nickname.json"), "r", encoding="utf-8"
         ) as f:
             nickname_json = json.loads(await f.read())
-    except Exception:
+    except (json.JSONDecodeError, FileNotFoundError):
         logger.error("刷新 nickname_json 表错误：无法载入 nickname.json 文件")