The Customer Service Center at the bottom of the official website and Contact Us in the navigation bar. VIP customer service provides contact information in the customer service center at the bottom of the official website and in the Contact Us in the navigation bar to facilitate the needs of different users. In the Contact Us in the navigation bar, it provides more comprehensive and direct contact information for users. You can communicate with VIP customer service at any time through telephone, online customer service, email, WeChat, etc. VIP is a database service platform under the domestic CNKI company, which provides various types of literature resources including journal articles, conference papers, patents, standards, scientific and technological reports, dissertations, etc.