diff --git a/CHANGELOGS/v9.md b/CHANGELOGS/v9.md
index 5be6682..b9f28d2 100644
--- a/CHANGELOGS/v9.md
+++ b/CHANGELOGS/v9.md
@@ -1,3 +1,7 @@
+v9.0.2  2021/11/06
++ 修复部分文档错误
++ 增加对多线程的支持
+
 v9.0.1  2021/11/02
 + 修复 video_uploader 上传大文件时转码失败的错误
 
diff --git a/bilibili_api/utils/network.py b/bilibili_api/utils/network.py
index 7d5c46f..b3f61be 100644
--- a/bilibili_api/utils/network.py
+++ b/bilibili_api/utils/network.py
@@ -16,20 +16,18 @@
 from .Credential import Credential
 from .. import settings
 
+__session_pool = {}
 
 @atexit.register
 def __clean():
     """
     程序退出清理操作。
     """
-    async def __clean_task():
-        await __session.close()
+    loop = asyncio.get_event_loop()
 
-    if __session is None or __session.closed:
-        return
+    async def __clean_task():
+        await __session_pool[loop].close()
 
-    loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
     if loop.is_closed():
         loop.run_until_complete(__clean_task())
     else:
@@ -161,9 +159,6 @@ async def request(method: str,
         return real_data
 
 
-__session: aiohttp.ClientSession = None
-
-
 def get_session():
     """
     获取当前模块的 aiohttp.ClientSession 对象，用于自定义请求
@@ -171,10 +166,13 @@ def get_session():
     Returns:
         aiohttp.ClientSession
     """
-    global __session
-    if __session is None:
-        __session = aiohttp.ClientSession(loop=asyncio.get_event_loop())
-    return __session
+    loop = asyncio.get_event_loop()
+    session = __session_pool.get(loop, None)
+    if session is None:
+        session = aiohttp.ClientSession(loop=loop)
+        __session_pool[loop] = session
+
+    return session
 
 
 def set_session(session: aiohttp.ClientSession):
@@ -184,8 +182,8 @@ def set_session(session: aiohttp.ClientSession):
     Args:
         session (aiohttp.ClientSession):  aiohttp.ClientSession 实例。
     """
-    global __session
-    __session = session
+    loop = asyncio.get_event_loop()
+    __session_pool[loop] = session
 
 
 def to_form_urlencoded(data: dict) -> str:
diff --git a/bilibili_api/utils/sync.py b/bilibili_api/utils/sync.py
index 1eaa176..9439277 100644
--- a/bilibili_api/utils/sync.py
+++ b/bilibili_api/utils/sync.py
@@ -1,6 +1,13 @@
 from typing import Coroutine
 import asyncio
 
+def __ensure_event_loop():
+    try:
+        asyncio.get_event_loop()
+
+    except:
+        asyncio.set_event_loop(asyncio.new_event_loop())
+
 
 def sync(coroutine: Coroutine):
     """
@@ -12,6 +19,7 @@ def sync(coroutine: Coroutine):
     Returns:
         该异步函数的返回值
     """
+    __ensure_event_loop()
     loop = asyncio.get_event_loop()
     return loop.run_until_complete(coroutine)
 
diff --git a/setup.py b/setup.py
index d286cc4..3b64a8f 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setuptools.setup(
     name='bilibili-api',
-    version='9.0.1',
+    version='9.0.2',
     license='GPLv3+',
     author='MoyuScript',
     description='哔哩哔哩的各种 API 调用便捷整合（视频、动态、直播等），另外附加一些常用的功能。',