Dear Tong Suan Choon,
Thanks for contacting Top China Travel!
You may take a taxi from Kaleserdom Hotel Changsha Railway Station Branch to reach Changsha West Bus Station or Changsha East Bus Station first, then take bus/coach at Changsha West Bus Station or Changsha East Bus Station to reach Zhangjiajie. Bus here departs every one hour from 8:00 am to 7:00 pm. And the journey takes about 4 hours.
Any further request or question, please feel free to contact with us.