"Chinese Library Classification" is a comprehensive classification used commonly by most libraries, information institutes and centers in China.  In 1999, its fourth edition was published after an effective revision to three key classes, such as Finance (F), Radio Electronics Tele-technology (TN), Automation Technology Computer Science (TP) by the Compilatory Committee, according to feedbacks and suggestions from lots of academic and public libraries. The following are its 22 classes.

A  Marxism, Leninism, Maoism & Deng   
      Xiaoping Theory

N  Natural Science

B  Philosophy and Religion

O  Mathematics, Physics and Chemistry

C  Social Science

P  Astronomy and Geoscience

D  Politics and Law

Q  Bioscience

E  Military Science

R  Medicine and Hygiene

F  Economics

S  Agricultural Science

G  Culture, Science and Education

T  Industrial Technology

H  Linguistics

U  Transportation

I   Literature

V  Aviation 

J  Art

X  Environmental Science

K  History and Geography

Z  Others