1, the emergence of private ownership, class and state: in slave society, the application of metal tools and large-scale slave labor promoted the further development of agriculture and animal husbandry, caused the division of labor between handicrafts and commerce, and brought prosperity to cities.

2. Entering the civilized era: On the basis of slave labor, there has been a division of labor between mental labor and manual labor, figures, many thinkers, scientists and educators ... creating brilliant achievements in ancient science and culture.

3. Savage exploitation system

4, brutal class rule, hierarchical. Slave owners oppress and exploit slaves by violent means, and the status of slaves is extremely low.