Which part of china is least developed economically?

Western China, including Tibet, Xinjiang, Qinghai, Gansu, Ningxia, Sichuan, Chongqing, Yunnan and Guizhou, is the most economically disadvantaged region in China. For a long time, western China has been plagued by a series of problems such as complex natural conditions, insufficient infrastructure construction, relatively poor economic foundation and low industrialization level, which have seriously restricted its economic development.

Although in recent years the central and local governments have adopted a series of preferential policies to support the economic development of western China, the overall economic development level of western China is still relatively backward compared with the eastern coastal areas. In 2021, the total economic output of western China accounted for only 24.3% of the country's total, while the total economic output of eastern China accounted for 64.5%. The gap between western China and eastern China is significant.