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Jiangnan in the Han Dynasty is vast and sparsely populated, with backward farming methods and low material living standards, but the polarization between the rich and the poor is also low. Jiangnan, the second generation of Southern Dynasties, has a large population and abundant materials.

1. Sufficient labor-a large number of northerners moved south, providing sufficient labor for the development of Jiangnan.

2, the improvement of production technology-advanced tool technology brought by farmers who moved to the south.

3. Stable social environment-there are few wars in Jiangnan and the society is relatively stable.

4. Good natural conditions-abundant rainfall, humid climate and fertile land in the south of the Yangtze River.