Full-text service is an extended service based on literature retrieval. According to users' requirements, the full text is provided by letter, email and fax. This service is a fee-based service, which requires users to register and pay in advance. Online full-text service provides free browsing, reading and downloading of online full-text periodicals purchased by NSTL. E-book lending service is a service project for some individual users in the west, and it needs to apply for authorization. Users wishing to obtain this service need to fill in the Application Form for Personal Account of Founder Appaby China West Online Digital Library System.