The structure changes of agricultural，industrial，domestic and eco-environmental water uses in Jiangxi province were analyzed according to the water use data from 1999 to 2016.The information entropy method was adopted to analyze the water structure change tendency of Jiangxi province.And then the influence factors of the changes of different water uses were summarized here.The results showed that：(1)generally speaking，the total water use of Jiangxi province showed a fluctuated upward trend，the agricultural water use showed a fluctuated slightly upward trend，the industrial water use showed an obvious rising trend，the domestic water use showed a linear growth trend，while the eco-environmental water use showed a steady rising trend；(2)the development and utilization structure of water resources in Jiangxi province evolves towards a more balanced and stable direction from both the information entropy evolution and the equilibrium degree perspectives；(3)the influence factors of water structure change in Jiangxi province are varied，including precipitation，irrigation area，industrial value-added，water use per ten thousand Yuan of industrial value-added，total population，water use per capita，urbanization rate and the attention to the ecological environment from the government and the public，etc.