In 2020，the COVID-19 has delivered a heavy blow to world economy，leading the growth of world GDP turnning to negative，the global trade contracts and the unemployment rates soar highly. After the early chaos，the world economy tends to rebound in a V type. Despite the high unemployment rate，the developed states and emerging market economies are expected to rebound simultaneously in the next year and the world economy may get back to the pre-pandemic level. Meanwhile，pandemic makes the distribution problem worse in developed states such as the United States and enhances the acceptance of economic sovereignty. As China rebounds from the pandemic recession more swiftly than other states by effective responses，its position in global trade and economy has been improved，and its rivalry with United States become fiercer. For China，the overall external situation will be much more challenging than before as United States and other powers restrict their FDI policy，access to financial market and export control. Therefore，the task to guarantee the overseas public security will also be more insurgent and complicated.