The third dose of bivalent cervical cancer vaccine is not recommended to be given in advance so as not to affect the immunization effect. Bivalent cervical cancer vaccine is an inactivated viral vaccine, which mainly prevents the two high-risk viruses HPV 16 and 18. Only by regular and continuous injection can the body be effectively stimulated to form a complete immune response and produce sufficient antibodies. The bivalent vaccine needs to be injected in the order of months 0, 1 and 6. If for some reason the third injection is not given on time, it must be given within one year of the completion of the first injection. This is because if the agreed injection time is exceeded, the antibodies produced previously will be too long, the T-cell immune memory will disappear, and the expected number of antibodies will not be produced when the injection is given again. It is recommended that the bivalent cervical cancer vaccine should be injected on time, and under special circumstances, it can be delayed under the guidance of a professional doctor, but it is best not to inject in advance.