How to travel from Haikou airport to Haikou bullet train station.

Both at Haikou Railway Station and Haikou East Railway Station, you could take the bullet train. However, there is no direct transport from Haikou Airport to any of these two stations. Upon arrival, it is suggested that you take a taxi to get there. Or, you could take bus 21 from Haikou Airport to Dingcun Lukou and then hire a taxi to the East Station. This way is much cheaper.

I recently travelled by the new high-speed railway from Haikou Dong (East) station to Wenchang. The train is very clean and efficient. It travels at 250 kph and the first class fare is only RMB24(=MR10). It also stops at Meilan Airport station but I don't know how far is it to the airport itself. Haikou airport is also called Meilan Airport

Do you mean the bullet train station at Haikou Airport? If so, you could follow the direction to the Airport Arrival Hall and then walk to the second floor, from where you could walk to the bullet train station in 15 minutes via a 300-meter tunnel.