Any bus or shuttle from Guangzhou Baiyan airport to Hongkong international airport? How often it runs?

No, there is not. I suggest you take airport shuttle bus line 5 to Hilbin Hotel (Globallink Hotel) and then catch a taxi to local Dongshan Hotel. Near the hotel, you can find the direct bus to HKIA. It takes around 4h and the bus fare is 200-250HKD per person! And the buses are scheduled from 05:15 to 19:15 every day!