how to go to airport from Bao Ann airport to Guanzhou the cheapest way?

From the airport, you can take the airport shuttle bus 330 to reach its terminal at the local railway station. From SZ Railway Station, you can find the direct bullet trains to reach Guangzhou.
The airport shuttle bus's fare is 20RMB and the bullet trains cost 80RMB for the second class seat and 100RMB for the first class seat.

Hi Andy, thanks for your reply. In your reply, which SZ railway station to go from Bao Ann airport? is it SZ north station?
By the way, is there any direct bus or coach service directly from Bao Ann Airport to Guangzhou? If yes, what is bus no to GZ? How much will the fare? Thank you so much.

No, it is the local main Railway Station at Luohu.

If you wanna take a bus to Guangzhou. You can take MTR Luobao line at Airport East MTR Station to Zhuzilin Station. Get out from Exit A and you can walk to Futian Bus Station, where there are frequent direct buses to Guangzhou.

Is there direct bus and coach service from Baoan Airport to Guangzhou?

No, there is no such bus. You can go to Futian Bus Station to catch a bus to Guangzhou.