The design of Shanghai Free Trade Port (SFTP) should be considered with the background of the Belt and the Road Initiative. The construction of SFTP needs the legal thought to manage some difficult issues. The special legal status of SFTP should be confirmed by the legislation. The so called “within the territory but outside the customs zone” should be interpreted by the statues. The “outside the customs zone ” should be understood as the immunity from the tariff regulations but not the whole customs law. The free movement of goods, capital and personal should be assured by the detailed regulations as well as the goods free from the customs duty. The “negative list” model could be used in the SFTP freedom system so that it could enhance the transparency.