There are only four districts in Sanya: Tianya District, Jiyang District, Yazhou District and Haitang District. Tianya District and Jiyang District include the urban area. It is reasonable to say that the city center is in Tianya District, and the best economic development is Tianya District. However, Mo Meier thinks that Sanya's economic lifeline is mostly distributed in Jiyang District: Sanya's transportation hubs include Phoenix Airport and Sanya Railway Station, all of which are in Jiyang District; Institutions of higher learning in Sanya, including Sanya College and Hainan Tropical Ocean College, are also located in Jiyang District. There are the most popular tourist resorts, including Yalong Bay, Dadonghai, Yalong Bay Tropical Paradise Forest Park and so on, which are also in Jiyang District ... Jiyang District has the strongest comprehensive strength.