New Crown vaccine is available in 2-dose and 3-dose varieties, with different intervals for each dose. 2-dose vaccination requires an interval of ≥3 weeks; 3-dose vaccination requires an interval of ≥4 weeks. 1. 2-dose vaccination: The interval between 2 doses is recommended to be more than or equal to 3 weeks (21 days), and the second dose can be given within 8 weeks (21-56 days). If for any special reason the second dose has not been given after 8 weeks, the second dose must be given as soon as possible in order to obtain complete immunization protection. 2. 3-dose vaccination: Recombinant subunit vaccine, with an interval of more than 4 weeks between the two adjacent doses. The second dose should be completed as soon as possible within 8 weeks after the first dose, and the third dose should be completed on time within 6 months after the first dose, that is to say, the third dose should be completed within half a year, only in this way can we get enough protective antibodies. When you receive the vaccination, you must follow the doctor’s instructions and receive the next vaccination on time.