1, math: 0 10 1.

2. Physics: 0 102.

3. Chemistry: 0 103.

4. astronomy: 0 104.

5. Geophysics: 0 105.

6. Geology: 0 106.

7. Biology: 0 107.

8. Ecology: 0 108.

9. Agricultural Science: 0 109.

10, forestry: 0 1 10.

1 1, environmental science and engineering: 011.

12, materials science and engineering: 0 1 12.

13, mechanical engineering: 020 1.

14, instrument science and technology: 0202.

15, physical chemistry of materials: 0203.

16, Energy and Power Engineering: 0204.

17, Electrical Engineering: 0205.

18, Electronic Science and Technology: 0206.

19, Information and Communication Engineering: 0207.

20. Computer Science and Technology: 0208.

Classification principles of category codes:

1, scientific principle. According to the objective and essential attributes of disciplines and their interrelationships, different subordinate relations and parallel orders are divided to form an orderly discipline classification system.

2. Practical principles. The basic goal of discipline classification and coding should be to meet the application needs of national macro-management, and the coverage of disciplines included in the classification system should be comprehensive and appropriate.

3. The principle of simplicity. The division and combination of subject levels should be simple and clear.

4. The principle of compatibility. Considering the inheritance of domestic traditional classification system and the continuity of practical use, we should pay attention to improving international comparability.

5. The principle of ductile expansion. According to the highly dynamic characteristics of modern science and technology system, we should leave room for emerging disciplines in the bud to expand and continue under a relatively stable classification system.

6. The principle of uniqueness. In the subject classification system, a subject can only use one name and one code. After the discipline is adjusted and changed, its original classification code is revoked and may not be handed over to other disciplines.