The new crown pneumonia epidemic occurred in a period of uncertainty in the world economy, and its impact on countries and the world economy is very far-reaching. In particular, China and the U.S., as the world's largest economies and the most severely affected countries, have the greatest impact on the world economy. The sudden new crown pneumonia epidemic has affected capital markets, the real economy, and the global trade links of various countries. Due to the rapid spread of the epidemic, class workers in various countries have caused continuous unemployment, and the unemployment rate has continued to rise. Governments of different countries use monetary and financial policies to combat the epidemic of new crown pneumonia and address the economic impact of the epidemic of new crown pneumonia, depending on national circumstances, the employment crisis, or the economy. Even a crisis can be prevented.