In recent years, as China's trade surplus with the U.S. continues to grow and Sino-U.S. trade friction intensifies, the foreign exchange risk of Chinese listed companies has become increasingly urgent. It is important to study a scientific and reasonable foreign exchange risk assessment system for listed companies' cross-border trade decisions. Based on this, firstly, this paper constructs a foreign exchange risk assessment index system for listed companies, then combines the entropy value method and Critic method to get the combination weights, and then uses the weighted TOPSIS method to construct a foreign exchange risk assessment system for listed companies. By selecting Chinese manufacturing listed enterprises from 2016-2021 as the sample, the empirical results show that: the foreign exchange risk of Chinese manufacturing listed enterprises increases significantly after 2018; the operating capacity of enterprises is more affected by the 2018 Sino-US trade war compared with other indicators, and relevant suggestions are put forward in conjunction with the actual situation.