Participants will be injected of vaccine or placebo on a three-dose schedule (0, 2, 6 months). After each inoculation, the immediate reaction will be observed for 30 minutes, and the local and systemic reaction will be systematically observed for 7 days. After the first inoculation, adverse event will be collected until one month after the final inoculation, while serious adverse event will be collected until 6 months after the final inoculation. For every participants, blood samples will be collected before the first inoculation (month 0), one month after the final inoculation (month 7), 6 months after the final inoculation (month 12) to detect the neutralizing antibody of HPV type 16 and 18, and proceed safety and immunogenicity analysis. For participants in 9-14 age group who received the vaccine, neutralizing antibody will also be detected in month 24, 36 and 48 to examine the immune persistency. Meanwhile, some participants will be chosen to study the deviation of gene expression after the vaccination and the association of that with the neutralizing antibody level.