Best transport from Fenghuang to Zhangjiajie.

There are two buses at 08:30 and 14:30 everyday, which will take you about 4 hours and about 65 RMB.

The buses can be taken at Fenghuang Bus Station.

Thank you, Ms Jenny.
I had read through Q&A, I understand that there is alternate route which is from Fenghuang to Jishou (about 1 hour) and from Jishou to Zhangjiajie ( 1 and half hour) by bus. Do you think this is the better choice-shorter hour?

That will be another good way.
To be honest, when I traveled there, I choose this way, because the buses were much easier to be catched. But I think transfering may be a little bit difficult, so I suggest you to the direct bus. If you want to make a transfer, the second way will be much better.
Hope you can have a nice trip there. Beautiful scenery.