I want go to Ganzhou from Shantou downtown or Jieyang Chaoshan Airport.

From SH to Ganzhou, there are two buses running every day at Qishan Bus Station; the ticket fare is CNY120 and the travel time is within 20 hours. Or there is one bullet train every day available at Chaoshan Railway Station. You can first take the bus from SH to Chaoshan Railway Station. The train ride is much faster than taking a bus, taking about 4.5 hours.

From Jieyang airport to Ganzhou, there is no bus running and you have to first get to Qishan Bus Station from the airport, and then take the bus at Qishan Bus Station to Ganzhou.