hello. what is a good option to take from the airport in SZX at 8.00 p.m to HK Kowloon? Thanks.

According to your arrival time, only coach is available.
You can take one at the airport, and get off at Central Station (Hong Kong). After 8pm, the bus schedules are 20:20, 20:40, 21:00, 21:20 and 21:40. The ticket fare is CNY 130 per person. After arriving, take a taxi to the destination directly. The cab fare is 70 HKD to 85 HKD at that time.