The National Library can find the link in VIP. After registration, the National Library of China can use VIP and other database resources free of charge, and some databases have download restrictions to log in to the National Library of China. There is a login registration in the upper right corner of the search box in the middle of the page (as shown below). Go to the next page, click Register in the upper right corner of the page, enter the corresponding information, return to the email address left by registration, and get the password. Then return to the landing site to open the first login, and modify the personal password in time after login. You can use the National Library in VIP.