Please help me, I need to travel from Nanjing to Jingzhou by bus.

From NJ, there is no direct bus to Jingzhou, so the bullet trains are suggested.
Eight bullet trains operate between the two cities. The fare is around 227RMB per second class seat, 273RMB per first class seat. The train takes about 5 hours to 5 hours and 20 minutes.
The bullet trains are from South NJ Railway Station to Jingzhou Railway Station.