Hainan has many advantages in the development of modern sports service industry. Under the background of accelerating the construction of Hainan Free Trade Port，the development of modern sports service industry has received a series of policy support from the central ministries and commissions. Hainan local government has also formulated a series of corresponding planning and implementation plans to promote the construction of national sports tourism demonstration zone. At present，the construction of national sports tourism demonstration zone in Hainan has achieved remarkable results，but there are still some problems that have not been properly solved at this stage. For example，the scale of sports industry needs to be expanded，the supply capacity of modern sports services is insufficient，the marketization and branding construction of sports events need to be strengthened，and the shortage of professional talents. By analyzing the current situation of Hainan’s construction of national sports tourism demonstration zone，this paper studies the advantages of Hainan’s development of modern sports service industry in policy，location，infrastructure construction and tourism resources. And in view of the existing constraints，put forward measures and suggestions such as further promoting infrastructure construction，strengthening marketing efforts，strengthening the introduction and training of professional sports tourism talents.