Among the vaccines currently in use in China, the two-dose New Crown vaccine is an inactivated vaccine, the one-dose New Crown vaccine is an adenovirus vector vaccine, and the three-dose New Crown vaccine is a recombinant subunit vaccine. Attenuated and inactivated vaccines are designations for vaccines prepared using traditional methods. One-dose and three-dose Neocrown vaccines are prepared by novel methods and are neither attenuated nor inactivated vaccines. Adenovirus vaccines are made by inserting the part of the neo-coronavirus gene that can cause the immune system to respond into the adenovirus that does not replicate and reproduce, so that the adenovirus expresses the antigen of the neo-coronavirus without producing the toxicity of the neo-coronavirus, helping the body to recognize and generate specific immunity. The recombinant subunit vaccine is made by extracting the immunologically active fragments of the virus through some technical means, and requires three doses to produce sufficient antibodies. All three vaccines have been proven to be protective and safe and can be administered with confidence. For those who need to travel to the infected area or abroad in an emergency, one dose of the New Crown vaccine can be given as a priority in order to obtain sufficient antibodies quickly. However, vaccination does not necessarily mean that you will not be infected with the New Coronavirus. Therefore, frequent hand washing, wearing a mask, and maintaining social distance are still important measures to prevent infection.