In the case of serious public health emergencies, it is of great significance to fully analyze the reaction of financial market and explain the mechanism behind it, so as to build or improve the relevant feasible emergency management system. In this paper, a variety of analysis methods are used to systematically explain the typical public health emergencies, based on the empirical research on the policies of China, America, Japan and Britain during the epidemic period, this paper explores the

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... ternal logic and correlation between different reactions in financial markets from multiple dimensions, and summarizes innovative interpretations of different reactions in financial markets. The results show that under the monetary policy based on ensuring liquidity, combined with effective epidemic prevention and control measures, only in this way can the economic and financial system impacted by the epidemic be saved.