What is the basis of book classification in primary and secondary school libraries? There are thousands of books in the library. If you put them all together, it's really looking for a needle in a haystack to find a book. Book classification is an important basic work of the library. With it, readers can "find books by classification". Book classification is a tool for library classifiers to sort books. It is a classification system organized by many categories of different sizes according to their different attributes and certain principles. Markers are used to represent all levels of categories to fix their order. The classification system of book classification is usually embodied in the form of tables, so it is also called book classification table. In 2003, the Ministry of Education revised and promulgated the Regulations for Libraries (Rooms) in Primary and Secondary Schools (Revised), which stipulated: "The book classification should be referred to as China Library Classification; Periodicals should be classified according to the periodical classification table of China Library Classification (i.e. data method). According to the number and characteristics of books in primary and secondary school libraries, it is classified according to the Library Classification of China (4th Edition). What are the basic categories and categories of China Library Classification? According to the characteristics of books and materials, according to the principle of from total to sub-division, from general to specific. (as shown in the following table) There are five categories and 22 basic categories. The first category is Marxism-Leninism, Mao Zedong Thought, the second category is philosophy and religion, the third category is social science (social science). The third category is introduction to social science. The third category is political law, military affairs, economic affairs, cultural science education, sports, language, literature, j art, k historical geography, the fourth category is natural science (natural science). N Introduction to natural science, O Mathematics, science, chemistry, P Astronomy, Earth science, Q Biological science,