Prompt documents include record documents and report documents. Document description is to accurately describe the content and formal characteristics of documents through various items, provide readers with bibliographic knowledge about various documents and help them understand the contents of collected documents; Reporting documents refers to publicizing and reporting related documents to readers according to a certain problem and a certain compiling purpose. Readers can retrieve the collected documents through the library catalogue. The first is the identification of documents, that is, through the contents and structural forms of various items, readers can identify and confirm the documents. Then literature retrieval, that is, through the concentration and combination of items, provides readers with ways to choose and obtain literature from the aspects of subject owner, theme and classification.