This is the architecture of China Library Classification, which divides all disciplines into five categories, and expands * * * under each category to form 22 categories. Twenty-two categories are represented by 22 pinyin letters, that is, book classification.

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

Philosophy, religion

Social Science-Introduction to Social Science

Politics, law

E military

F economy

G. Culture, science, education and sports

H. Language and writing

I. Literature

J art

History, geography

Introduction to natural science

Mathematical science and chemistry

P astronomy, earth science

Q bioscience

Medicine and health

American agricultural science

technology

U transportation

V. Aviation and aerospace

X. Environmental Science and Safety Science

Comprehensive books ... Z comprehensive books

Under the twenty-two categories, there are several sub-categories, which are subordinate at different levels and subdivided step by step.