The coefficient of variation method and the analytic hierarchy process(AHP)method were used to calculate combined weights. The grey correlation coefficient of the grey correlation analysis method was applied to the fuzzy relation matrix in the fuzzy comprehensive evaluation model. Combined with qualitative and quantitative analyses, the fuzzy comprehensive evaluation model was modified. The improved fuzzy comprehensive evaluation method was used to evaluate the water resources carrying capacity of Jiangyin City. The evaluation results agreed with those of the traditional fuzzy comprehensive evaluation method. In addition, the degree of membership with regard to various evaluation grades showed an insignificant difference, and the subjective effect was reduced, indicating that the improved evaluation method is applicable to regional water resources carrying capacity.