Since Central Committee of CCP issued “overall Plan for the Construction of Hainan Free Trade Port” in June 2020，Hainan Free Trade Port has initially formed an investment system integration covering areas such as market access system，investment freedom system，fair competition system，and property rights protection system. However，to compare with high-level international investment agreements，Hainan Free Trade Port still has room for improvement. At present，the shortcomings of the system should be complemented as soon as possible in areas such as the prohibition of performance requirements，anti-monopoly in the area of mergers and acquisitions，and dispute resolution between investors and the investment host country. In the future，Hainan Free Trade Port should catch up with international high-level investment agreements，further expand the breath and depth of its opening to the outside world. Explore financial opening，encourage new business models，to project the pilot international board of securities market，allow joint stock limited companies to issue preferred shares，and actively solicit RCEP member countries’ foreign investment. Sufficient policy space should be reserved in all these fields to continue to promote the development and improvement of the integration of Hainan Free trade port investment system integration.