用管理员账户sa登陆，然后在master下新建查询：

在查询窗体输入：

declare @i int declare cur cursor for select spid from sysprocesses where db_name(dbid)= '要断开连接的数据库名称' open cur fetch next from cur into @i while @@fetch_status=0 begin exec('kill '+@i) fetch next from cur into @i end close cur deallocate cur