diff --git a/app/admin/views.py b/app/admin/views.py
index 6711ca3..a2def59 100644
--- a/app/admin/views.py
+++ b/app/admin/views.py
@@ -492,7 +492,7 @@ def off_download():
         user=request.form.get('user')
         for url in urls:
             if url.strip()!='':
-                cmd=u'python {} download_and_upload "{}" "{}" {}'.format(os.path.join(config_dir,'function.py'),url,grand_path,user)
+                cmd=u'nohup python {} download_and_upload "{}" "{}" {} &'.format(os.path.join(config_dir,'function.py'),url,grand_path,user)
                 subprocess.Popen(cmd,shell=True)
         return jsonify({'status':True,'msg':'ok'})
     path=request.args.get('path')
diff --git a/app/utils/offdownload.py b/app/utils/offdownload.py
index 921115e..250aafc 100644
--- a/app/utils/offdownload.py
+++ b/app/utils/offdownload.py
@@ -35,7 +35,7 @@ def download_and_upload(url,remote_dir,user,gid=None):
             mon_db.down_db.insert_one(item)
             return
         cur_order=mon_db.down_db.count()
-        option={"dir":down_path,"split":"16","max-connection-per-server":"8","seed-ratio":"0.1","bt-save-metadata":"false","bt-max-peers":"200","header":["User-Agent:Transmission/2.77"]}
+        option={"dir":down_path,"split":"16","max-connection-per-server":"8","seed-ratio":"0.1",'force-save':'true',"bt-save-metadata":"false","bt-max-peers":"200","header":["User-Agent:Transmission/2.77"]}
         item={}
         r=p.addUri(url,option)
         gid=json.loads(r)[0]["result"]
diff --git a/function.py b/function.py
index e979015..8fddc20 100755
--- a/function.py
+++ b/function.py
@@ -5,7 +5,12 @@ from app.utils import *
 if __name__=='__main__':
     func=sys.argv[1]
     if len(sys.argv)>2:
-        args=sys.argv[2:]
-        eval(func+str(tuple(args)))
+        if sys.argv[-1]=='&':
+            if len(sys.argv)>3:
+                args=sys.argv[2:-1]
+                eval(func+str(tuple(args)))
+        else:
+            args=sys.argv[2:]
+            eval(func+str(tuple(args)))
     else:
         eval(func+'()')
diff --git a/update.sh b/update.sh
index 602a6db..e5ca67f 100755
--- a/update.sh
+++ b/update.sh
@@ -120,6 +120,8 @@ echo "2019.02.16更新版本：优化PyOne4.0安装流程！"
 echo "2019.02.19更新版本：优化细节"
 echo "2019.02.20更新版本：1. 填坑！2. 后台可配置mongo和redis信息；3. 优化离线下载体验；4. 输出日志"
 echo "2019.02.21更新版本：修复自定义代码bug"
+echo "2019.02.22更新版本：优化离线下载功能（重启网站后任务不中断）"
+
 upgrade_to4
 upgrade
 restart