Hello can you help me? How can i go beijing- zhangjiajie? Bus or train?

Well, there is no bus there, so you can take a train at BJ Railway Station, there are two trains at 8:45 and 16:16 to ZJJ. It takes you more than 24 hours and at least CNY198 to get there.
Since it’s such a long time, you can also go there by air from Capital Airport, and there are 3 direct flights, one at 6:25 and two at 18:25. The first takes nearly 5 hours, the last two take nearly 3 hours.