China Library Classification is a classification based on scientific classification and combined with the characteristics of books. The current edition is the fourth edition, and the fifth edition will be published soon. It divides disciplines into five categories: Marxism-Leninism and Mao Zedong Thought; Philosophy; Social science; Natural science; Comprehensive books. The Library Classification of China adopts the mixed numbering of Chinese phonetic alphabet and Arabic numerals, with one letter representing a major category, reflecting the alphabetical order of major categories, and the letters are marked 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. 22 categories: A Marxism-Leninism, Mao Zedong Thought B Philosophy C Introduction to Social Sciences D Politics, Law E Military F Economy G Culture, Science, Education, Sports H Language, Writing I Literature J Art K History, Geography N Introduction to Natural Sciences O Mathematics Science and Chemistry P Astronomy, Earth Science Q Biological Science R Medicine, Health S Agricultural Science T Industrial Science TB General Industrial Technology TD Mining Engineering Te Oil and Gas Industry TF Gold Industry TG Metallurgy, Metal technology th mechanical instrument technology TJ weapon industry TK electric power industry TL atomic energy technology TM electric technology TN radio electronics, telecommunication technology TP automation technology, computing technology TQ chemical industry TS light industry, handicraft industry TU building science TV water conservancy project U transportation V aviation, aerospace X environmental science Z comprehensive books and documents classification procedures are: literature subject analysis → classification → numbering → checking.

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