diff --git a/README.md b/README.md
index 7451c22c..4b2a63f9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # QChatGPT
 
 通过调用OpenAI GPT-3模型提供的Completion API来实现一个更加智能的QQ机器人  
+使用SQLite储存会话内容，保证回复内容符合上下文  
 已部署的测试机器人QQ: 960164003  
 交流群、答疑群: 204785790  
 无需云服务器，在个人电脑上即可部署
@@ -9,7 +10,6 @@
 
 - [Mirai](https://github.com/mamoe/mirai) 高效率 QQ 机器人支持库
 - [YiriMirai](https://github.com/YiriMiraiProject/YiriMirai) 一个轻量级、低耦合的基于 mirai-api-http 的 Python SDK。
-- PyMySQL MySQL驱动
 - [OpenAI API](https://openai.com/api/) OpenAI API
 
 ## 项目结构
@@ -42,11 +42,7 @@
 
 按照[此教程](https://yiri-mirai.wybxc.cc/tutorials/01/configuration)配置Mirai及YiriMirai
 
-### 3. 配置MySQL数据库
-
-安装MySQL数据库，创建数据库`qchatgpt`
-
-### 4. 配置此程序
+### 3. 配置主程序
 
 1. 克隆此项目
 
diff --git a/config-template.py b/config-template.py
index 39bff7a8..a34ae187 100644
--- a/config-template.py
+++ b/config-template.py
@@ -15,20 +15,6 @@ mirai_http_api_config = {
     "qq": 0
 }
 
-# [必需] MySQL数据库的配置
-# host: 数据库地址
-# port: 数据库端口
-# user: 数据库用户名
-# password: 数据库密码
-# database: 数据库名
-mysql_config = {
-    "host": "",
-    "port": 3306,
-    "user": "",
-    "password": "",
-    "database": ""
-}
-
 # [必需] OpenAI的配置
 # api_key: OpenAI的API Key
 openai_config = {
diff --git a/main.py b/main.py
index f13921c8..1b581bfa 100644
--- a/main.py
+++ b/main.py
@@ -17,9 +17,8 @@ log_colors_config = {
 
 
 def init_db():
-    import config
     import pkg.database.manager
-    database = pkg.database.manager.DatabaseManager(**config.mysql_config)
+    database = pkg.database.manager.DatabaseManager()
 
     database.initialize_database()
 
@@ -54,7 +53,7 @@ def main():
     # 主启动流程
     openai_interact = pkg.openai.manager.OpenAIInteract(config.openai_config['api_key'], config.completion_api_params)
 
-    database = pkg.database.manager.DatabaseManager(**config.mysql_config)
+    database = pkg.database.manager.DatabaseManager()
 
     # 加载所有未超时的session
     pkg.openai.session.load_sessions()
diff --git a/pkg/database/manager.py b/pkg/database/manager.py
index 1e8d79c5..9d46f828 100644
--- a/pkg/database/manager.py
+++ b/pkg/database/manager.py
@@ -1,52 +1,35 @@
-import threading
 import time
 
-import pymysql
 from pymysql.converters import escape_string
 
+import sqlite3
+
 import config
 
 inst = None
 
 
 class DatabaseManager:
-    host = ''
-    port = 0
-    user = ''
-    password = ''
-    database = ''
     conn = None
     cursor = None
 
-    def __init__(self, host: str, port: int, user: str, password: str, database: str):
-        self.host = host
-        self.port = port
-        self.user = user
-        self.password = password
-        self.database = database
+    def __init__(self):
 
         self.reconnect()
 
-        heartbeat_proxy = threading.Thread(target=self.heartbeat, daemon=True)
-        heartbeat_proxy.start()
 
         global inst
         inst = self
 
-    def heartbeat(self):
-        while True:
-            time.sleep(30)
-            self.conn.ping(reconnect=True)
-
     def reconnect(self):
-        self.conn = pymysql.connect(host=self.host, port=self.port, user=self.user, password=self.password,
-                                    database=self.database, autocommit=True)
+        self.conn = sqlite3.connect('database.db', check_same_thread=False)
+        # self.conn.isolation_level = None
         self.cursor = self.conn.cursor()
 
     def initialize_database(self):
         self.cursor.execute("""
         create table if not exists `sessions` (
-            `id` bigint not null auto_increment primary key,
+            `id` INTEGER PRIMARY KEY AUTOINCREMENT,
             `name` varchar(255) not null,
             `type` varchar(255) not null,
             `number` bigint not null,
@@ -56,6 +39,7 @@ class DatabaseManager:
             `prompt` text not null
         )
         """)
+        self.conn.commit()
         print('Database initialized.')
 
     def persistence_session(self, subject_type: str, subject_number: int, create_timestamp: int,
@@ -73,27 +57,32 @@ class DatabaseManager:
             values ('{}', '{}', {}, {}, {}, '{}')
             """.format("{}_{}".format(subject_type, subject_number), subject_type, subject_number, create_timestamp,
                        last_interact_timestamp, escape_string(prompt)))
+            self.conn.commit()
         else:
             self.cursor.execute("""
             update `sessions` set `last_interact_timestamp` = {}, `prompt` = '{}' 
             where `type` = '{}' and `number` = {} and `create_timestamp` = {}
             """.format(last_interact_timestamp, escape_string(prompt), subject_type,
                        subject_number, create_timestamp))
+            self.conn.commit()
 
     def explicit_close_session(self, session_name: str, create_timestamp: int):
         self.cursor.execute("""
         update `sessions` set `status` = 'explicitly_closed' where `name` = '{}' and `create_timestamp` = {}
         """.format(session_name, create_timestamp))
+        self.conn.commit()
 
     def set_session_ongoing(self, session_name: str, create_timestamp: int):
         self.cursor.execute("""
         update `sessions` set `status` = 'on_going' where `name` = '{}' and `create_timestamp` = {}
         """.format(session_name, create_timestamp))
+        self.conn.commit()
 
     def set_session_expired(self, session_name: str, create_timestamp: int):
         self.cursor.execute("""
         update `sessions` set `status` = 'expired' where `name` = '{}' and `create_timestamp` = {}
         """.format(session_name, create_timestamp))
+        self.conn.commit()
 
     # 记载还没过期的session数据
     def load_valid_sessions(self) -> dict: