if i want to take the subway from baiun airport to the bauhinia hotel which ststion shalll i stop.

Well, you can take subway line 3 from where you are and get off at Jiahewanggang Station. Then you need transfer to subway line 2 to Haizhu Plaza Station. After that, you can walk to your hotel in several minutes. The whole journey takes about 10 RMB.
By the way, the suttle bus line 5 can directly take you to Haizhu Plaza. Upon your getting off, you can walk to your hotel very fast. 20 RMB is needed to pay.