The free trade zone is generally a non-tariff area that allows foreign goods to be tax-free and import-free. This paper discusses the policy evolution and development of the free trade zone in the narrow sense. In addition, because the free trade zone is affected by the start time, geographical location, and economic level of the hinterland, the policies of the respective trade zones are very different. This paper chooses to transform the function of the free trade zone from the external manifestation of the free trade zone policy. Indepth understanding of the evolution and development of the free trade zone policy in the process of functional evolution in the development of the three internationally renowned and unique free trade zones of the Free Trade Zone, the Irish Shannon Free Trade Zone and the Hamburg Free Trade Zone Gaining inspiration and summing up experience, hoping to provide ideas and help for China's development of free trade zone.