Recently, the National Vaccine Research and Development Task Force conducted a special study on whether or not to carry out booster vaccination, and found that vaccination with the New Crown vaccine booster is safe, and that booster vaccination can improve the protective effect of the vaccine from the perspective of immunogenicity. In addition, the results of clinical studies have shown that there is a different degree of antibody decline after 6 months of vaccination, and the results of studies by Sinopharm Zhongsheng and Beijing Kexing on booster vaccination have shown that when the third dose, or booster, is administered within 6 months, there is a rapid increase in antibody levels in the vaccinees. Antibodies begin to rise rapidly 3 days after vaccination and can reach a high level in about 7 days, with antibody levels ranging from 15-30 times the original level at 14 days. According to the pattern after the conventional vaccination, the test after 6 months of the booster injection reveals that there is also a decrease in antibody, but it is still at a lower level than the peak of the 2-dose vaccination. Moreover, according to the safety results of the phase I/II clinical trial of the Chinese biologic New Crown inactivated vaccine booster, there was no significant difference in the incidence of total adverse reactions between 2 and 3 doses after the 3rd dose for people aged 18-59 and 60 years or older. immunization data for people aged 18 years or older after 3 doses of New Crown vaccine were better than those after 2 doses; data from small-scale trials for people aged 3-17 years showed that the incidence of adverse reactions after 3 doses of New Crown The incidence of adverse reactions was not significantly different from that of 2 doses, and the immunization data was also better than that of 2 doses. The overall results of the study indicate that the booster dose of New Crown vaccine was safe and well tolerated, and induced a strong antibody response.