how to travel from zhangjiajie national forest park to yangshuo

There is no direct bus or train from Zhangjiajie to Yangshuo. You may take a taxi to Zhangjiajie Passenger Center and get on a coach to Changsha Lituo Bus Station first. There are three coaches a day departing at 7:30, 9:30, and 11:00.
Upon arrival, take a high speed train from the opposite Changsha South Railway Station to Guilin. Then go to the nearby Guilin Passenger Station to catch a bus to Yangshuo.