Analysis of historical formation of agricultural areas in Sichuan basin and geographical factors

The earliest agricultural activities in Sichuan Basin can be traced back to the middle Neolithic Age. During the development process afterwards, the Qin and Han dynasties, the Sui and Tang dynasties, and the Northern Song Dynasty were three peaks of agricultural development. The various natural conditions resulted in a variety of agricultural patterns in Sichuan Basin. The drainage system played a major role and always went before land and agricultural development in different historical periods. The wars and natural disasters in the end of the Ming Dynasty severely damaged the agricultural system. It was until the early and middle Qing Dynasty that many immigrants from other provinces restored and promoted the agricultural activities in Sichuan Basin.