In 2018，the United States，prompted by the idea of “America First”，levies tariffs on billions of dollars’ worth of Chinese products，and China is forced to fight back. The China-US trade conflicts break. Based on GTAP，this article conducts simulation analysis of the impact of the trade conflicts on the Chinese economy，the American economy and the world economy. The modelling includes 10 economies of Australia，China，Japan，South Korea，Vietnam，India，European Union，United States，Mexico，other countries in the world，and 56 sectors to conduct a dynamic medium and long-term simulation.