In this study， information entropy and equilibrium degree methods were used to evaluate the water consumption structure evolution from 2003 to 2017 of Ji'an city.The main driving factors were identified by using principal component analysis，and GM（1，1）model was established to predict the water consumption in future years.The results revealed that the main water consumption in Ji'an city was agricultural water consumption，and the proportion of ecological water consumption was less important.The total water consumption showed an increasing trend，among which the proportion of agricultural water consumption showed a decreasing trend.The results of information entropy and equilibrium degree was first declined and then increased，showing an increasing trend on the whole and indicating that the regional water use structure was developed towards an ideal（equilibrium）state.The main driving factors affecting the water structure of Ji'an city include population，social and economic development，industrial and agricultural output and climate characteristics.Agricultural water consumption and total water consumption will decrease in the future，while industrial water consumption，domestic water consumption and ecological water consumption will increase.