China Library Classification (formerly known as China Library Classification), referred to as Chinese 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.
China Library Classification is divided into 5 basic classifications and 22 categories. Use English letters and Arabic numerals to mix numbers, with one letter representing a major category, reflecting the alphabetical order of major categories, and mark letters with numbers. In order to adapt to the development of industrial technology and the classification of this kind of literature, the two-letter classification of industrial technology is adopted.