how can i go to qing shen from chengdu? and how far is it?

You can go to Chengbei Long-distance Bus Station to catch bus to Qingshen. The bus runs from 06:30 to 17:30. It is about 110-120km by road from Chengdu to Qingshen.

There are 2 parts of the Qingcheng Mountain,the Front and the Back one.
Most of the tourists are visiting the front one,it's easy to go, take a train from the Chengdu North Rail way station ,from 7:30am, almost every hour(some are every half an hour) there is
a high speed train to Qingcheng Front mountain,60km away,50min.
I would strongly recommend the Back Mountain to the people who love hiking and pretty scenery . Take a shuttle bus from the Qingcheng Rail way station to the Back Mountain is about 30 min.