At present, there are 3 types of new crown vaccines in China, of which the 2nd injection of both inactivated vaccine and recombinant protein vaccine is recommended to be completed within 8 weeks, and adenovirus vector vaccine often requires another booster dose 6 months after the 1st injection. 1. Inactivated vaccine: It is the new crown vaccine that is widely available in China, and it is a 2-dose vaccine. According to the recommendation of the CDC, the interval between the 2nd injection and the 1st injection is generally no more than 8 weeks, in order to prevent the decrease of antibody production capacity caused by delaying for too long, and the timely vaccination of the 2nd injection after an interval of 3 weeks can effectively stimulate the organism to produce sufficient antibodies and reduce the risk of infection with the virus. 2. Recombinant protein vaccine: It is a 3-dose vaccine, with an interval of more than 4 weeks between the adjacent 2 doses, the second dose needs to be completed within 8 weeks, and the third dose needs to be completed within 6 months to ensure the vaccine’s preventive effect. 3. Adenovirus carrier vaccine: This vaccine is a 1-dose dose, but a booster dose can be given after 6 months of age. When receiving the new crown vaccine, you should take the initiative to provide the doctor with your health status and whether you have a recent history of taking medication. You need to stay for 30 minutes after the vaccination before leaving, pay attention to drinking plenty of water and resting, and keep the habit of wearing a mask and washing your hands frequently even after the vaccination.