The hpv vaccine prevents human papillomavirus, and the hpv bivalent vaccine mainly prevents the two subtypes of hpv16 and hpv18. The hpv16 and hpv18 subtypes are high-risk infections with a relatively high chance of developing cancerous lesions, so the hpv bivalent vaccine is used to prevent these two types of viral infections. hpv16, hpv18 two subtypes belong to hpv high risk type, once infected is relatively easy to cause cervical cancer and pre-cancerous lesions, and injection of hpv bivalent vaccine is mainly for hpv16, hpv18 these two types of infection. After the injection of the vaccine, the human body will form a certain amount of antibodies, and then when there is an invasion of the hpv virus, the immune system will form an attack to prevent the virus from entering the body, so as to achieve the effect of prevention.