The first two doses of BKX and the third dose of Conjugate can strengthen the protective effect, which is in line with the current vaccination policy. If Beijing Coxin is administered in the first two doses and Conxinol in the third, there are generally no adverse effects. The two vaccines are only different in technology, Beijing Coxin belongs to the inactivated Neocoronavirus vaccine and Conxinol belongs to the adenovirus vector vaccine, both of which are based on the Neocoronavirus. This vaccination method can strengthen the protective effect of the vaccine, especially in the face of the current epidemic of omicron variant strains, and is in line with China’s current vaccination policy, which advocates sequential vaccination, that is, vaccination of different routes of the new coronavirus vaccine, so as to achieve a more comprehensive protection.