Groundwater quality is affected by various indexes, and the influence of each index on groundwater quality is fuzzy. Therefore, adopting a reasonable evaluation method can make the groundwater quality evaluation more accurate. Although fuzzy comprehensive evaluation method has great advantages in analyzing fuzzy problems, it has shortcomings in solving problems like weight calculation. The fuzzy comprehensive evaluation method was improved by combining with the entropy weight method in this study. On basis of this, a groundwater quality evaluation model was established. At the same time, by taking the groundwater aquifer of Cambrian Gaotai formation in Cengong County, Guizhou Province as a research object and based on the water quality monitoring data of 14 boreholes there, the model was adopted to evaluate the water quality of the aquifer by combining with GIS technology. The results demonstrated the feasibility and superiority of the improved fuzzy comprehensive theory in groundwater quality evaluation.

地下水水质受多种指标的影响，每个指标对地下水水质的影响是模糊的。因此，采用合理的评价方法可以使地下水水质评价更加准确。模糊综合评价法虽然在分析模糊问题方面有很大的优势，但在解决权重计算等问题上却有不足之处。本文结合熵权法对模糊综合评价方法进行了改进。在此基础上，建立了地下水水质评价模型。同时，以贵州省岑巩县寒武系高台组地下水含水层为研究对象，并根据该省14个钻孔的水质监测数据，结合GIS技术，采用该模型对含水层水质进行评价。结果证明了改进的模糊综合理论在地下水水质评价中的可行性和优越性。