古代长江上游地区经历了四次大规模的区域开发。古蜀开创了养蚕缫丝之法和成都平原稻作区 ,初步治理了岷江、沱江水患。秦汉时期开辟了南北水陆路交通 ,向巴蜀地区大规模移民 ,兴建了成都城市群落 ,建设了都江堰水利工程 ,提高了巴蜀文化教育水平。两宋时期改善了四川社会环境并选拔了大量优秀人才 ,移民浪潮促成了百余年的经济发展。清代鼓励移民入川垦殖 ,实行轻徭薄赋 ,重视地方经济开发 ,改善南北水路交通。这些开发有许多成功的经验 ,也留下了不少教训 The ancient upper reaches of the Yangtze River experienced four large-scale regional development. The ancient Shu created silk reeling method and the Chengdu Plain rice area, the initial control of the Minjiang River, Tuojiang floods. During the Qin and Han dynasties, North-South land and sea traffic was opened up, large-scale immigration was carried out to Bashu, urban communities in Chengdu were built, Dujiangyan Water Conservancy Project was built, and Bashu culture and education level was raised. During the Song and Song dynasties, the social environment in Sichuan was improved and a large number of outstanding talents were selected. The wave of immigration contributed to the economic development over the past hundred years. In the Qing Dynasty, immigrants were encouraged to reclaim their land and cultivated in Sichuan. They implemented frivolous and light taxes, paid more attention to local economic development, and improved the traffic between North and South waterways. These developments have many successful experiences and have left a lot of lessons