How to go From Baiyun international airport to bullet train station, which goes to shenzhen

The bullet train for Shenzhen can be taken in East Railway Station. So you can take airport shuttle bus line 6 to the Tianhe Square which is very close to that station. You can ask the local people to go there directly. Or you can take the subway line 3 to reach the station directly.
Actually, there are direct buses at the airport to Shenzhen, departing at 09:50, 10:50, 11:50, 12:50, 13:50, 14:50, 15:50, 16:50, 17:50, 18:50, 19:50, 20:50.