Dear sir doyou have flight from GUANGZHOU(CAN) to HAIKOU (HAK) please mention some of them thanks

Yes, there are.
Flights no. CZ6772 and CZ6790, operated by CHINA SOUTHERN AIRLINES, directly fly between and it takes around 1h and 10min. The former leaves 06:55 and the latter leaves at 09:40. Besides, there are other flights operates by the airline.

Flights no. HU7304 and HU7008 are operates by Hainan Airlines. They depart at 19:40 and 11:00 respectively.

For more information, you can find at the FLIGHT page at thi website.