1, and the subject classification number is the subject classification code. According to the division of disciplines by the Ministry of Education and the proportion of disciplines in colleges and universities, the existing colleges and universities are divided into 13 categories, such as comprehensive, liberal arts, science, liberal arts, science, engineering, agriculture, medicine, law, literature, management, sports, art and so on.

2. China Library Classification is the abbreviation of China Library Classification. According to the characteristics of books and materials, the classification system is determined according to the principle of from general library to sub-library and from general library to special library. On the basis of five basic categories, 22 categories are formed.

Second, the usage is different:

1. According to the proportion of various disciplines, Peking University belongs to a comprehensive category, and according to the scale of scientific research, Peking University belongs to a research type, so the type of Peking University is a comprehensive research type, referred to as comprehensive research type. For another example, according to the proportion of disciplines, Tsinghua belongs to engineering, and according to the scale of scientific research, Tsinghua belongs to research type, so Tsinghua's type is engineering research type, referred to as engineering research type.

2. The symbol of China Library Classification adopts a mixed number of Chinese phonetic alphabet and Arabic numerals. That is, a letter represents a big category, and the order of big categories is embodied in alphabetical order. The letters are followed by numbers, indicating the division of the following categories. Numbers are numbered in decimal.

Extended data:

"Information science" in the classification table refers to a small concept, excluding "computer science". The theoretical and technical parts of "information science and system science" are similar in nature to mathematics and arranged after mathematics. Considering its development prospect, it is set as a first-class discipline. Information science and system science are based on cybernetics, system theory and information theory, which are difficult to separate, so they are listed in the same category for the time being.

Environmental science and technology, safety science and technology and management are comprehensive disciplines, which rank between natural science and social science.

According to the actual situation in China, "Psychology" is listed in two disciplines under "Pedagogy". "Geography" is included in two disciplines under "Earth Science", and "Human Geography" is included in "Earth Science", which is a special case.

Baidu encyclopedia-subject classification number

Baidu Encyclopedia-China Library Classification