Abstract: As an important resource for human survival and social development,the carrying capacity of water resources plays an important role in enhancing regional strength and coordinating development. Aiming at the problems that it is difficult to present spatial relationship and inaccurate quantitative evaluation in the evaluation of water resources carrying capacity,this paper takes Wuhu City as an example and selects 16 evaluation indexes such as per capita water resources,water production modulus and rainfall from three aspects of water resources,economy and ecology. DEMATEL is used to determine the influence relationship between each element. Aiming at the defects of traditional entropy weight method,the traditional entropy weight method is improved and its objective weight is calculated. The subjective weight of each index is determined by using network analytic hierarchy process,and the subjective and objective weights are combined by multiplication synthesis method. Finally,the fuzzy comprehensive evaluation method is used to calculate the evaluation value of regional water resources carrying capacity to construct the evaluation system of water resources carrying capacity in Wuhu City. Taking the data of Wuhu City from2006 to 2016 as an example,the results show that the evaluation value of water resources carrying capacity in Wuhu City ranges from 0.407 1to 0.637 0,with the lowest value in 2006（0.407 1）and the highest value in 2016（0.637 0）. The water resources carrying capacity in this area increased except in 2011 and 2013,and the water resources carrying capacity is in a critical state. This method better considers the characteristics of the network relationship between the evaluation indexes of water resources carrying capacity,improves the defects of the traditional entropy weight method,and combines the subjective and objective weights to evaluate the water resources carrying capacity more reliably and accurately. The research results can provide certain reference for the development and utilization of water resources in the region.