Abstract: Determining the weights of indices is the foundation of comprehensive evaluation of water resources. Previous studies, usually using a single weight determination method, resulted in the differences of results. The paper proposed an improved method of rank correlation analysis to determine the weights of indices. Firstly, the evaluation index system of sustainable utilization of water resources of Beijing is constructed. Secondly, a consistency test on different orders given by experts is made and the orders that do not pass the consistency test are eliminated. And then, the thought of circular revision is used to unify the orders of index importance. Finally, the rate of importance is acquired by the ratios of the standard deviations between the two adjacent indices. The paper set up the evaluation model of water resource sustainable utilization in Beijing based on improved method of rank correlation analysis, and then the model was applied to appraise the water resources status of Beijing from 2005 to 2010. The research showed that the new weighing method of improved rank correlation analysis could reflect both experts'opinion and data information. It also settled the problem of allocating subjective and objective weights.