Children between 3 and 11 years of age need to be vaccinated twice with the second dose given 21 to 56 days apart from the first. The main purpose of the vaccination is to effectively prevent infection by the New Crown virus. Since the epidemic is still unstable, the first dose of the New Crown vaccine serves as a basic immunization, inducing the body to produce an immune response. The second dose serves as a booster immunization, resulting in a higher antibody positivity rate. If, for special reasons, the second vaccination is not given within 21 to 56 days, it is necessary to find a time to catch up as soon as possible, and there is no need to start a new round of vaccination program. It is recommended that the two doses of New Crown vaccine be given as close as possible to the same type and manufacturer of vaccine, or the same type if there is no vaccine from the same manufacturer. New Crown vaccination for children aged 3 to 11 years should be given in the company of family members and under the supervision of a doctor.