1. China Library Classification (formerly known as China Library Classification) is a representative large-scale comprehensive classification compiled and published after the founding of the People's Republic of China, and it is the most widely used classification system in domestic libraries today, referred to as Chinese Library Classification for short. The first edition of China Library Classification was published in 1975, and the fourth edition was published in 1999. The fourth edition of the revised China Library Classification has added the category of classified materials, which is distinguished from the category of classified books by a "+",so it was officially renamed as China Library Classification, with the abbreviation unchanged. The fourth edition of Library Classification of China comprehensively supplements new themes, expands the category system, and makes the classification keep pace with the development of science and technology. At the same time, standardize categories, improve the reference system and annotation system, adjust the category system, and add sub-tables, so as to obviously strengthen the expansion of categories and the accuracy of classification.

2. Dewey decimal classification is influenced by Harris classification of St. Louis Library. According to Bacon's knowledge classification thought in the 0/7th century, human knowledge is divided into three parts: memory (history), imagination (literature and art) and rationality (philosophy, that is, science), which are arranged upside down and expanded to 10 (the following class names are quoted from the 20th edition of DC).