Inclusion Criteria:
1. Chinese men aged 18-45 years who can provide legal identification and have a sexual life history;
2. Subjects fully understands the study procedures, understands the risks and benefits associated with participating in the study, and voluntarily signs the informed consent;
3. Subjects are able to read, understand and fill in the research application forms such as diary CARDS and contact CARDS, and promise to participate in regular follow-up according to the study requirements;
4. Heterosexual men subjects must have exclusively female sexual partners and no more than 5 before enrollment;
5. MSM subject must have had sex with men within the past year (either insertive or receptive anal intercourse); and the cumulative number of sexual partners (including male and female sexual partners) does not exceed 5 before enrollment;
6. Subjects agree to provide effective contact information that can be used for communication with the researchers during the study;
7. Subjects consent to external anogenital lesion inspection and sample collection (including but not limited to wet swab collection and necessary biopsy) during the study period;
8. Subjects agree to take effective contraceptive measures from the first dose to 1 month after the last dose \[male effective contraception including abstinence, male condom, vasectomy, etc.; female valid contraception including the pill (excluding emergency contraception), injection or embedded contraception, sustained-release topical contraceptives, hormonal patch, intrauterine devices (IUD), sterilization, diaphragm, cervical caps, etc.; safe period contraception, extracorporeal ejaculation, and emergency contraception are unacceptable contraception.\]
Exclusion Criteria:
Initial inoculation exclusion criteria (If the "\*" option is met during screening, the enrollment can be postponed and the re-screening can be rescheduled )
1. \* Subjects with axillary temperature ≥37.3℃ 24 hours before the first vaccination;
2. \* Higher blood pressure on the day of the first vaccination (systolic blood pressure ≥140mmHg and/or diastolic blood pressure ≥90mmHg);
3. \* Sexual activity (including anal, vaginal/genital contact of the same or opposite sex) within 48 hours prior to the sampling visit; Self-shave hair from genital area within 24 hours prior to the genital examination visit (and/or using any post-shaving lotions or lubricants);
4. Have been or planned to be vaccinated with commercially available HPV vaccine; Have participated in or plan to participate in other HPV vaccine clinical trials;
5. Previous positive HPV test results (including types not included in the investigational vaccine) or related cytological abnormalities；
6. Previous or current HPV-related genital warts, penile/perianal/perineal intraepithelial neoplasia, penile/perianal/perineal cancer, anal intraepithelial neoplasia, or anal cancer;
7. Significant clinical evidence of external genital lesions and anal diseases (only MSM) suggesting the HPV infection during the external anogenital inspection before the first vaccination;
8. \* Acute illness or acute episode of chronic disease, or use of antipyretic, analgesic and antiallergic drugs (e.g., acetaminophen, ibuprofen, aspirin, loratadine, cetirizine, etc.) within 3 days prior to vaccination;
9. \* Received inactivated/recombinant/nucleic acid vaccine (non-attenuated vaccine) within 7 days prior to recruitment, or attenuated vaccine within 14 days prior to enrollment;
10. \* Received any immune globulin or blood derived products within 3 months prior to enrollment, or plan to use any between the first vaccination and 1 month after full immunization;
11. \* Received immunosuppressive therapy within 1 month prior to vaccination, such as immunosuppressive doses of glucocorticoids (dose reference: equivalent to prednisone 20mg/day for more than 7 days), or monoclonal antibodies, thymosin, interferon, etc., or plan to receive such treatment during the first dose until 1 month after full immunization, but topical administration (such as ointment, eye drops, inhalants or nasal sprays) is allowed;
12. Other investigational or unregistered products (drug or vaccine) that have been used within 3 months prior to the first dose or are planned to be used during the study period;
13. Present or have a history of convulsions (except febrile convulsions in childhood (0-14 years)), epilepsy, other serious neurological diseases (such as transverse myelitis, Guillain-Barre syndrome, demyelinating diseases, etc.);
14. Present or have a history of mental illness or the family history;
15. There are contraindications to intramuscular injection, such as having been diagnosed with thrombocytopenia, any coagulation dysfunction, or being treated with anticoagulants;
16. Any condition resulting in asplenia or functional asplenia；
17. A history of severe allergic reactions requiring medical intervention (such as anaphylactic shock, anaphylactic laryngeal edema, allergic purpura, thrombocytopenic purpura, local allergic necrosis (Arthus reaction), etc.); A history of severe adverse reactions to previous vaccination or a history of severe allergies (e.g. mouth and throat swelling, dyspnea, hypotension or shock, severe urticaria, etc.) to any vaccine component (histidine, sodium chloride, polysorbate 80, aluminum phosphate adjuvant and water for injection) ;
18. Subjects have been diagnosed with congenital or acquired immunodeficiency disease, such as: AIDS, lymphoma, leukemia, systemic lupus erythematosus, rheumatoid arthritis, juvenile rheumatoid arthritis, inflammatory bowel disease or other immune disorders;
19. Currently have a serious infectious disease such as active tuberculosis, active viral hepatitis or acquired immunodeficiency syndrome (HIV infection);
20. Diagnosed with a serious congenital malformation or chronic disease that may interfere with the conduct or completion of the study, such as Down syndrome, heart disease, liver disease, kidney disease, diabetes with complications, or malignant tumors;
21. A history of drug abuse prior to enrolling, or a history of drug or alcohol abuse or dependence within the last year;
22. Subjects plan to permanently relocate from the region before the completion of the study or leave the region for a long period of time during the scheduled visit (affecting the scheduled visit time);
23. Investigators consider that the subjects have any condition that may interfere with the evaluation of the objectives of the study, or that participation in the study does not guarantee the maximum benefit of the subjects.
