The China HIV/AIDS Information Network (CHAIN) is a nationwide information exchange and sharing platform that involves the government, non-governmental organizations, and international organizations. Over the past five years, it has received strong support from many related institutions and projects both domestically and internationally. The purpose of CHAIN's work is to promote the exchange of relevant information and resource sharing in China's HIV/AIDS prevention and treatment sector, as well as the promotion of best practices. It also aims to strengthen information communication and cooperation among multiple sectors of society, including government organizations, NGOs, media, grassroots groups, and enterprises. As an open exchange platform for sharing public information, CHAIN invites all interested organizations and individuals to participate in its development. CHAIN will adhere to the principles of fairness, timeliness, accuracy, and objectivity, providing trustworthy and valuable information resources oriented towards user needs for the government and all sectors of society.