Where can book an airport transfer from Haikou for 6-9 pax?

Dear Cindy, I know the Top 1 Car Rental Service is available at the 1st floor of the domestic arrival hall in the airport. U can book the transfer service from them in advance. For details, dial this hotline to consult directly: 4006-788-588

And if you have booked a hotel in the city, it is also a good way to ask your hotel to arrange the transfer service.
May help!