The Poyang Lake Basin consists of Ganjiang Basin, Fuhe Basin, Xinjiang Basin, Raohe Basin, Xiushui Basin and Poyang lake area, accounted for 97.2% of the area of Jiangxi. The different basin provide different develop conditions, and cause intra and inter-regional differences in economic development. On the base of different economic level of region in Poyang Lake Basin, we used Theil Index to analyze the space decomposition, and revealed the reasons and basic laws t...