There are 22 basic categories in China Library Classification, which are expressed by Chinese phonetic alphabet, as follows:

I Marxism-Leninism, Mao Zedong Thought and Deng Xiaoping Theory.

b？ Philosophy, religion

Introduction to social science

d？ Politics, law

e？ military affairs

f？ economy

g？ Culture, science, education, sports

h？ Language, writing

Me? literature

j？ art

k？ History, geography

n？ Introduction to natural science

o？ Mathematical science and chemistry

P astronomy, earth science

q？ Biological Science

r？ Medicine and health

s？ agro-science

t？ technology

u？ transport

v？ Aviation and aerospace

X environmental science, labor protection science (safety science)

Z comprehensive books

Extended data:

China Library Classification is based on the similarities and differences of books' subject content or other characteristics. According to a certain system, books of all disciplines are divided into several categories according to their subject content, and each category is divided into many subcategories, and each subcategory is subdivided into molecular subcategories. Finally, every kind of book can be divided into certain categories, and each category has a category number. ?

In the call number of each book, every letter, number, decimal point, slash and bracket has its specific meaning. The call number is like the "ID number" of every book. Readers can find the books they want to borrow by checking the shelves alphabetically and numerically. The classification number only determines which shelf it is on, and the species number determines the specific scope. Finally, the position of the book can be determined according to the size of the number.

Baidu Encyclopedia-China Library Book Classification