This interventional study targets female students in junior middle school. It goal is to evaluate the effectiveness of a vaccine chatbot on HPV vaccine awareness and vaccination. The main questions it aims to answer are: 1. How will the novel digital tool, a vaccine chatbot, impact eligible parents' awareness and knowledge of HPV vaccines, their willingness to vaccinate their daughters, and vaccination status of female students. 2. How is the vaccine chatbots accepted by all stakeholders, and what are the facilitators of and barriers to implementing vaccine chatbot promotion campaign. The intervention group will go through the intervention measure while the control group will not: 1. The intervention group will be invited to use the HPV vaccine chatbot online through WeChat , the mostly widely used social media platform in mainland China, or any web browsers. They can ask any questions related to the HPV vaccine and get validated answers from the chatbot immediately. The intervention lasts two weeks, with invitations sent every four days to reinforce the intervention. 2. The control group will not use the chatbot during the intervention duration. Researchers will compare participants' HPV vaccine awareness, and vaccination intention and status after intervention between intervention group and control group to evaluate if the vaccine chatbot improves HPV vaccine awareness and vaccination.