As a special economic zone with the highest degree of openness in the world，the free trade port has gone through the upgrading and transformation process from shipping transfer to processing and manufacturing，to resource allocation and urban alliance. As an upgraded version of the pilot free trade zone，the combination of free trade port and “One Belt And One Road” will effectively promote the process of China’s new round of reform and opening up. This report summarizes the functional purpose and design of main free ports in the world，and gives an enlightment over China’s free trade ports development.