As a test field of the new open economic system，the pilot free trade zone has developed from the institutional innovation stage to the replication and promotion stage and the higher-level open and experimental stage，as a result，the institutional spillover effect is significant.Hainan Pilot Free Trade Zone（Port）'s establishment marks that the establishment of new open economic system has stepped from the regional stage to the comprehensively and deepening open experimental stage.If the pilot free trade zone is the “test field” 1.0 for the new open economic system，then the pilot free trade port would be the “test field” 2.0 for the new open economic system.The core issues for the new-stage reform，on the one hand，are the innovation and experiment of the simple and low-tax fiscal and taxation system，and on the other hand，refer to the innovation and experiment of capital allocation marketization system.As the frontier of China's opening up，the pilot free trade zone should grasp the opportunity of Sino-US trade war，to actively participate in the formulation of international trade rules and establish new comprehensively open system by taking the trade war as a breakthrough of reform.