Abstract: To scientifically evaluate the water quality of Xiaoyun Coal Mine,16 sandstone water samples were selected and evaluated based on 8 water quality indicators.The water quality of Xiaoyun mining area was evaluated through principal factor analysis,coefficient of variation entropy weight method,and normal cloud model.SPSS software was used to extract SO₄^2-,total hardness,Cl^-,and F^-as the main control indicators for water quality evaluation from 8 water quality evaluation indicators using principal factor analysis;On this basis,the index weights are determined by combining the coefficient of variation method and entropy weight method.A normal cloud model is established using Matlab to obtain the water quality membership degree of each water sample in the Xiaoyun mining area,and the water quality grade of the mining area is determined.The results indicate that the overall water quality pollution in Xiaoyun mining area is severe,and the evaluation results of the main factor normal cloud model more objectively reflect the water quality characteristics of the mining area.Using this model to comprehensively evaluate the water quality of mine water can provide a certain theoretical basis for the treatment of mine water environment.