Since the outbreak of the epidemic, neither the US federal government nor the US Congress has been aware of the seriousness of the epidemic, which is the subjective reason for the slow action of the US in the early stage of the epidemic. The U. S. national system also limits the ability of local governments to take emergency measures. Only when the US federal government declares a state of national emergency can the Congress allocate funds and the federal government take some severe measures to prevent and control the epidemic. This is the objective reason why the US has not responded to the outbreak in a timely and effective manner