After two consecutive rounds of "invasion" of the COVID-19 epidemic in Wuhan and Beijing, the COVID-19 epidemic in China has basically been effectively controlled. However, the global pandemic of COVID-19, which continues to refresh human history outside the country, reminds us all the time that the threat caused by COVID-19 has not really been eliminated. In the post-epidemic era, how to take off the mask and return to a normal life has become a mist of doubt in the public mind. Many scholars, including the top infectious disease expert Anthony Fauci in the United States, have pointed out that we will not be able to completely stop the epidemic without a vaccine. And based on the current understanding of the COVID-19, many domestic experts and scholars also believe that if the first half of the "blocking war" of this epidemic is mainly based on prevention and treatment, then the second half will mainly rely on the advent of vaccines. Fortunately, China, which was the first to emerge from the storm of the COVID-19, is currently in the world's first leading position in the research and development of new COVID-19 vaccines.