Natural conditions: ① monsoon climate, high temperature and rainy summer, rain and heat at the same time; ② Alluvial plain with flat terrain and fertile soil; ③ Adequate irrigation water source.
Socio-economic conditions: ① The production process of rice planting is complex and labor-intensive, which requires a lot of labor, and the labor force here is abundant; (2) Where the rice yield per unit area is high, the population is dense and the cultivated land per capita is less, the population's pressure on the land and the demand for food can be alleviated; ③ There is a long history of planting rice here, and there is a traditional experience of intensive cultivation; ④ Rice is the main food people like.