Libraries generally adopt the traditional retrieval mode.

Three Chinese literature database systems in China: China Knowledge Network, Wanfang and China Journal Network.

Wanfang Data Resource System (China Information) was developed by China Institute of Science and Technology Information and Wan Fang Data Co., Ltd. This database contains a wide range of journals, including academic journals and non-academic journals, and provides full-text retrieval of about 2,000 electronic journals.

All included academic journals have obtained the certificate of "China Core Journals (Selected) Database Source Journals". Individual journals even changed "featured" to "featured" or simply removed it. Many authors mistakenly believe that this is a core journal.

Content of literature database

This corresponds to its traditional literature information. The content and formal features of a book or a document are recorded to form a clause. Entries are the basic units of literature information.

In literature database, a term is called record, and record is also the basic unit of literature database. Entries are composed of descriptive entries such as title, author and subject, and descriptive entries are called fields in the literature database. A field can be subdivided into several subfields. In this way, the literature database consists of a series of continuous records, fields and subfields, and forms a hierarchical tree structure.