diff --git a/nonebot_bison/config/db_config.py b/nonebot_bison/config/db_config.py
index 996bf2e..b50f306 100644
--- a/nonebot_bison/config/db_config.py
+++ b/nonebot_bison/config/db_config.py
@@ -363,5 +363,16 @@ class DBConfig:
             res.sort(key=lambda x: (x.target.platform_name, x.cookie_id, x.target_id))
             return res
 
+    async def clear_db(self):
+        """清空数据库"""
+        async with create_session() as sess:
+            await sess.execute(delete(User))
+            await sess.execute(delete(Target))
+            await sess.execute(delete(ScheduleTimeWeight))
+            await sess.execute(delete(Subscribe))
+            await sess.execute(delete(Cookie))
+            await sess.execute(delete(CookieTarget))
+            await sess.commit()
+
 
 config = DBConfig()
diff --git a/tests/conftest.py b/tests/conftest.py
index 65a1066..2d3c0ab 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -123,3 +123,13 @@ async def _no_browser(app: App, mocker: MockerFixture):
 
     mocker.patch.object(plugin_config, "bison_use_browser", False)
     mocker.patch("nonebot_bison.platform.unavailable_paltforms", _get_unavailable_platforms())
+
+
+@pytest.fixture
+async def _clear_db():
+    from nonebot_bison.config import config
+
+    await config.clear_db()
+    yield
+    await config.clear_db()
+    return
diff --git a/tests/sub_manager/test_add_cookie.py b/tests/sub_manager/test_add_cookie.py
index 28c2317..e6d4653 100644
--- a/tests/sub_manager/test_add_cookie.py
+++ b/tests/sub_manager/test_add_cookie.py
@@ -1,5 +1,6 @@
 import json
 
+import pytest
 from nonebug.app import App
 from pytest_mock import MockerFixture
 
@@ -30,7 +31,8 @@ async def test_add_cookie_rule(app: App, mocker: MockerFixture):
         ctx.should_pass_permission()
 
 
-async def test_add_cookie_target_no_cookie(app: App, mocker: MockerFixture):
+@pytest.mark.usefixtures("_clear_db")
+async def test_add_cookie_target_no_cookie(app: App):
     from nonebot.adapters.onebot.v11.bot import Bot
     from nonebot.adapters.onebot.v11.message import Message
 
@@ -80,7 +82,8 @@ async def test_add_cookie_target_no_cookie(app: App, mocker: MockerFixture):
         )
 
 
-async def test_add_cookie(app: App, mocker: MockerFixture):
+@pytest.mark.usefixtures("_clear_db")
+async def test_add_cookie(app: App):
     from nonebot.adapters.onebot.v11.bot import Bot
     from nonebot.adapters.onebot.v11.message import Message
 
@@ -192,7 +195,6 @@ async def test_add_cookie(app: App, mocker: MockerFixture):
 
 
 async def test_add_cookie_target_no_target(app: App, mocker: MockerFixture):
-
     from nonebot.adapters.onebot.v11.bot import Bot
     from nonebot.adapters.onebot.v11.message import Message
 
diff --git a/tests/sub_manager/test_delete_cookie.py b/tests/sub_manager/test_delete_cookie.py
index b3541ea..44827de 100644
--- a/tests/sub_manager/test_delete_cookie.py
+++ b/tests/sub_manager/test_delete_cookie.py
@@ -1,10 +1,72 @@
 import json
 
+import pytest
 from nonebug.app import App
 
 from ..utils import fake_superuser, fake_private_message_event
 
 
+@pytest.mark.usefixtures("_clear_db")
+async def test_del_cookie(app: App):
+    from nonebug_saa import should_send_saa
+    from nonebot.adapters.onebot.v11.bot import Bot
+    from nonebot.adapters.onebot.v11.message import Message
+    from nonebot_plugin_saa import TargetQQGroup, MessageFactory
+
+    from nonebot_bison.config import config
+    from nonebot_bison.config.db_model import Cookie
+    from nonebot_bison.types import Target as T_Target
+    from nonebot_bison.sub_manager import del_cookie_matcher
+
+    async with app.test_matcher(del_cookie_matcher) as ctx:
+        bot = ctx.create_bot(base=Bot)
+        event = fake_private_message_event(
+            message=Message("删除cookie"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
+        )
+        ctx.receive_event(bot, event)
+        ctx.should_pass_rule()
+        ctx.should_pass_permission()
+        ctx.should_call_send(event, "暂无已添加的 Cookie\n请使用“添加cookie”命令添加", True)
+
+    async with app.test_matcher(del_cookie_matcher) as ctx:
+        bot = ctx.create_bot(base=Bot)
+        target = T_Target("weibo_id")
+        platform_name = "weibo"
+        await config.add_subscribe(
+            TargetQQGroup(group_id=123),
+            target=target,
+            target_name="weibo_name",
+            platform_name=platform_name,
+            cats=[],
+            tags=[],
+        )
+        await config.add_cookie(Cookie(content=json.dumps({"cookie": "test"}), site_name="weibo.com"))
+
+        event_1 = fake_private_message_event(
+            message=Message("删除cookie"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
+        )
+        ctx.receive_event(bot, event_1)
+        ctx.should_pass_rule()
+        ctx.should_pass_permission()
+        should_send_saa(
+            ctx,
+            MessageFactory(
+                "已添加的 Cookie 为：\n1 weibo.com unnamed cookie"
+                " 0个关联\n请输入要删除的 Cookie 的序号\n输入'取消'中止"
+            ),
+            bot,
+            event=event_1,
+        )
+        event_2 = fake_private_message_event(
+            message=Message("1"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
+        )
+        ctx.receive_event(bot, event_2)
+        ctx.should_pass_rule()
+        ctx.should_pass_permission()
+        ctx.should_call_send(event_2, "删除成功", True)
+
+
+@pytest.mark.usefixtures("_clear_db")
 async def test_del_cookie_err(app: App):
     from nonebug_saa import should_send_saa
     from nonebot.adapters.onebot.v11.bot import Bot
@@ -71,62 +133,3 @@ async def test_del_cookie_err(app: App):
         ctx.should_call_send(event_2, "只能删除未关联的 Cookie，请使用“取消关联cookie”命令取消关联", True)
         ctx.should_call_send(event_2, "删除错误", True)
         ctx.should_rejected()
-
-
-async def test_del_cookie(app: App):
-    from nonebug_saa import should_send_saa
-    from nonebot.adapters.onebot.v11.bot import Bot
-    from nonebot.adapters.onebot.v11.message import Message
-    from nonebot_plugin_saa import TargetQQGroup, MessageFactory
-
-    from nonebot_bison.config import config
-    from nonebot_bison.config.db_model import Cookie
-    from nonebot_bison.types import Target as T_Target
-    from nonebot_bison.sub_manager import del_cookie_matcher
-
-    async with app.test_matcher(del_cookie_matcher) as ctx:
-        bot = ctx.create_bot(base=Bot)
-        event = fake_private_message_event(
-            message=Message("删除cookie"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
-        )
-        ctx.receive_event(bot, event)
-        ctx.should_pass_rule()
-        ctx.should_pass_permission()
-        ctx.should_call_send(event, "暂无已添加的 Cookie\n请使用“添加cookie”命令添加", True)
-
-    async with app.test_matcher(del_cookie_matcher) as ctx:
-        bot = ctx.create_bot(base=Bot)
-        target = T_Target("weibo_id")
-        platform_name = "weibo"
-        await config.add_subscribe(
-            TargetQQGroup(group_id=123),
-            target=target,
-            target_name="weibo_name",
-            platform_name=platform_name,
-            cats=[],
-            tags=[],
-        )
-        await config.add_cookie(Cookie(content=json.dumps({"cookie": "test"}), site_name="weibo.com"))
-
-        event_1 = fake_private_message_event(
-            message=Message("删除cookie"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
-        )
-        ctx.receive_event(bot, event_1)
-        ctx.should_pass_rule()
-        ctx.should_pass_permission()
-        should_send_saa(
-            ctx,
-            MessageFactory(
-                "已添加的 Cookie 为：\n1 weibo.com unnamed cookie"
-                " 0个关联\n请输入要删除的 Cookie 的序号\n输入'取消'中止"
-            ),
-            bot,
-            event=event_1,
-        )
-        event_2 = fake_private_message_event(
-            message=Message("1"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
-        )
-        ctx.receive_event(bot, event_2)
-        ctx.should_pass_rule()
-        ctx.should_pass_permission()
-        ctx.should_call_send(event_2, "删除成功", True)
diff --git a/tests/subs_io/test_subs_io.py b/tests/subs_io/test_subs_io.py
index 364f1fb..700becf 100644
--- a/tests/subs_io/test_subs_io.py
+++ b/tests/subs_io/test_subs_io.py
@@ -5,6 +5,7 @@ from nonebot.compat import model_dump
 from .utils import get_json
 
 
+@pytest.mark.usefixtures("_clear_db")
 async def test_subs_export(app: App, init_scheduler):
     from nonebot_plugin_saa import TargetQQGroup