There are three types of neo-coronavirus vaccines approved for marketing in China, namely inactivated neo-coronavirus vaccine (Vero cells), recombinant neo-coronavirus vaccine (type 5 adenovirus vector) and recombinant neo-coronavirus vaccine (CHO cells). The vaccines are divided into 1, 2 and 3 doses, of which only 1 dose of the recombinant neo-coronavirus vaccine with adenovirus vector type 5 is required to provide protection against the vaccine, but the other vaccines require the completion of the corresponding immunization program. The New Coronavirus vaccine is effective regardless of the number of doses given. For the 1-dose New Coronavirus vaccine, 1 dose can provide the appropriate defense effect, while for the 2-dose and 3-dose New Coronavirus vaccine, 1 dose can also provide a certain effect and stimulate the immune mechanism in the body, but it does not complete the entire immunization process and the corresponding effect is weaker, while the subsequent injections are intended to enhance the immune effect, solidify the immune mechanism and form a memory to facilitate The purpose of subsequent injections is to strengthen the immune effect, solidify the immune mechanism, and form a memory to resist viruses that enter the body afterwards. Therefore, vaccinators need to try to complete the vaccination within the prescribed time according to the type of vaccine they received and by the number of shots. If, for some reason, the vaccination is not completed according to the procedure, it is recommended that the vaccination be made up in time, without the need to restart the immunization process, and that the vaccination of the corresponding program shots be completed. It is recommended to choose the same vaccine product for the vaccination process, and if special circumstances make it impossible to complete the vaccination with the same vaccine product, it is also possible to complete the vaccination with the same type of vaccine product produced by other companies.