1, Marxist works
2. Philosophy
3. Social science
4. Natural science
5. Comprehensive books
Among them, social science can be subdivided into:
1, Introduction to Social Sciences
2. Politics and law
3. Military
4. Economy
5, culture, science, education, sports
6. Language and writing
7. Literature (including world literature and national literature)
8. Art (including painting, sculpture, calligraphy, seal cutting, music, drama and dance, photography and architectural art, primitive art)
9. History (including archaeology and world history, national history) and geography.