Flat terrain, abundant water, rain and heat at the same time. Sichuan basin belongs to subtropical monsoon climate, and the advantages of developing agriculture in this terrain area are flat terrain, fertile soil, sufficient water, sufficient sunlight and sufficient heat. The purple soil distributed in Sichuan Basin covers an area of140,000 square kilometers, with neutral or neutral alkalescence, rich in mineral nutrients such as phosphorus and potassium, moderate in texture and good in water permeability and ventilation.