A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education. The library originated from the habit of taking notes. The library is a special place for readers to use library documents.
The reading room of a library is generally divided into general reading room, professional reading room and reference research room. The reading room of a library is generally divided into general reading room, professional reading room and reference research room. The professional work of the library consists of many interrelated work links. Generally, it includes four parts: document collection, collation, collection and service.
Library literature arrangement: including literature classification, subject indexing, description and catalogue organization. Document classification not only provides the basis for compiling classified catalogue and document shelving, but also facilitates library statistics, new book publicity, reference consultation and document retrieval. Document subject indexing is to reveal and organize documents with subject words according to the subject range discussed in the document content.