China Library Classification, referred to as Chinese Library Classification for short, is a book classification widely used in libraries in China at present ("Book classification is a classification table compiled according to certain ideas, scientific classification and the contents and characteristics of books and materials." ), there is a "primary and secondary edition" specifically for primary and secondary school libraries. At present, the fourth edition of China Library Classification has been revised and published and renamed as China Library Classification. China Library Classification is mainly composed of classification tables and identifiers. I. Structure of Classification Table The structure of classification table in China Library Classification is: basic categories, broad categories, brief tables and detailed tables. There are five basic categories: Marxism-Leninism, Mao Zedong Thought, Philosophy, Social Sciences, Natural Sciences and Comprehensive Books. 2. The basic departments are divided into 22 categories. Their identifiers and class names are as follows: A Marxism-Leninism, Mao Zedong Thought B Philosophy C Introduction to Social Science D Politics, Law E Military F Economy G Culture, Science, Education, Sports H Language, Literature I Art K History, Geography n Introduction to Natural Science O Mathematical Chemistry P Astronomy, Earth Science Q Biological Science R Medicine, Health S Agricultural Science T Industrial Technology U Transportation V Aviation, Aerospace X Environmental Science Z Comprehensive Books 3 and 22. For example, G can be divided into: G0 (cultural theory), G 1 (current situation of cultural and educational undertakings around the world), G2 (information and knowledge dissemination), G3 (science and research), G4 (education) and G8 (sports). There are subdivisions under each category, such as G4 (education), G40 (pedagogy), G4 1 (ideological and political education, moral education), and so on. There are subdivisions under each category. For example, G6 1 (preschool education and preschool education), G62 (primary education), G63 (secondary education), G64 (higher education) and G65 (normal education) are subdivided under each category. And so on. Two, "China Library Classification" identification symbols using Chinese phonetic alphabet and Arabic numerals mixed number. For example, the classification number of "English Teaching Reference Books for Senior High School" is G633.4438+0, and that of "Internet Short Course" is TP393.4. In the actual work of the library, in order to facilitate shelving (putting books on shelves according to the classification rules or other order, which is convenient for management and search), it is generally necessary to add another number according to the title or author or others (such as serial number), and usually use the author's four-corner number to form a "classification" This symbol form is usually used as a way for library shelving management and readers to retrieve books.