The body produces anti-virus antibodies after infection with the new coronavirus is cured, and there is no need to receive a booster shot of the new coronavirus vaccine when the antibody titer is high. When the antibody titer gradually decreases and the protective power is insufficient, a booster vaccination can be given. The purpose of booster vaccination is to raise the antibody titer level against the novel coronavirus in the body to better prevent infection. For people who have recovered from novel coronavirus infection, there is no need to continue to receive booster vaccination if their antibody titers are high. However, the antibody titer level will gradually decrease over time. If the antibody titer drops significantly, a booster shot can be given again as appropriate. People with low immune function, people over 60 years old, people traveling to high-risk areas outside of China, and medical personnel engaged in outbreak prevention and control need to pay extra attention to the titer level of antibodies in their bodies, and need to receive a booster vaccination in time to maintain their antibody level to cope with the possible risk of infection after the titer level of antibodies in their bodies has dropped. Therefore, the need for booster vaccination after recovery from novel coronavirus infection should be analyzed dynamically according to the titer level of antibodies in the body.