Hi I am arriving Hongkong at 6 15 am and want to travel to Guangzhou .

You can catch a long distance bus at the airport to GZ, which will stop at Hotel Landmark Canton. It operates from 07:00 to 21:50 with the interval of about 10-60 minutes. The ticket fare is HK$250/person. The duration is about 3.5 hours. Upon arrival at that hotel, you may walk about 450 meters to Haizhu Plaza Station and take metro line 2 to Changgang Station. Then you may transfer metro line 8 to Xingang East Station, Exit A. When you get out of the station, you can find the exhibition center easily.