If you miss the second dose of the New Crown vaccine, you can catch up as soon as possible. The new crown vaccine is divided into recombinant subunit vaccine with a three-dose basic immunization program, inactivated vaccine with a two-dose basic immunization program, and recombinant vector vaccine with a one-dose basic immunization program. The recombinant subunit vaccines and inactivated vaccines are the ones that usually require a second dose. The interval between the second vaccination and the first vaccination is required to be greater than or equal to more than three weeks, and the second vaccination should be completed within eight weeks of the first vaccination as far as possible. If you have not received the second vaccination more than eight weeks after the first vaccination, you should be vaccinated as soon as possible. It is important to note that in the vaccination should try to use the same enterprise varieties to complete the second injection of this, if encountered with the same varieties of insufficient supply of the situation, you can use the same type of vaccine products of other production units for replacement of the vaccine, such as the first injection of the inactivated vaccine of the new coronavirus, the second injection should be selected for the inactivated vaccine of the new coronavirus. At present, the third booster vaccination has begun, and it is recommended that after the second vaccination, the booster vaccination should be given as soon as possible under the conditions of booster vaccination to enhance the protective effect. Consultation with a physician is required for specific cases.