Nearest bus station from Center Renmin Er Duan to Mount Qing Cheng

Well, Xinnanmen Bus Station is the nearer one. The bus schedules are 07:50, 08:30 and 13:30. It costs CNY 25 per person.
BTW, there are also bullet trains from CD Raiwlay Station to Qingchenshan. There is one departure at 07:02. Duration is about an hour and ticket fare is CNY 15 for a soft seat.

yes thank you for your infomation. :>
i would prefer the train but the problem is i found out that the train is / will be under maintenance at the time of my travel. could u verify if this is true? i plan to go.to qingchengshan on sept25th

I haven't heard about that the trains will be under maintenance. Also by searching the official website, I found the tickets for those trains on Sep.25 are available. If the train stops running, they should stop selling the ticket.