把游客用户组设置没有权限浏览帖子就好了(To make the visitor group as no rights to view threads)，也就是说只给注册了的会员用户组浏览帖子的权限(that's to say, give the rights to the registered members only for them to view the threads)，具体到论坛系统设置－用户管理－用户组－游客－详情(look at the following steps:system settings--member admin--member groups--visitors-details) (sorry not sure if am well matached the discuz systems terms)
ps：使用方面的问题请到安装使用区发帖。(for more info about the user guidance pls refer to the INSTALL&USERS GUIDANCE SECTION)
