China-US economic and trade relation have been zigzagging forward with tariff dispute and negotiation since 2018. Chinese free trade areas strategy and the “Belt and Road” are important to adapt to the complex external environment and cope with China-US trade frictions. Both of them are aimed at market opening，trade facilitating and investment limitless，which are important elements in making new ground in pursuing opening up on all fronts. In this context，this paper analyses the necessity of the coevolution of free trade areas construction and the “Belt and Road” from micro firm-level and macro open-view，and untangle previous and current development status of the two elements based on quantity and quality. The causes for the coordinated development of the free trade areas construction and the “Belt and Road” are complex，China-US trade friction has increased the risk factors. For the difficulties and challenges from the coevolution development，we put forward to promote higher-standard bi-directional liberalization，improve the ability to set up and broad new trade topics，actively participate in regional cooperation，support WTO reform and build Chinese dominated global value chains.