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为了克服传统生物评价方法评价结果较为粗糙的缺点，提出利用模糊数学的原理，选用多种生物指数进行生物评价结果分界线的模糊性改造，以期用隶属函数来描述水质分级。通过选取传统生物指数评价结果分级界线的中值作为基准点构造隶属函数，提高了生物指数评价方法的精确性和合理性，提出了多项生物指数模糊评价的基本方法，并在浑江水库的水质评价中取得了较好的应用效果。“,”In order to overcome the shortcoming of the unprecision of traditional biological evaluation,the method by using fuzzy mathematics principle to choose various biological indexes to from the mem-bership functions of boundary line of appraisal result so as to describe the water quality grade hasbeen put forward in this paper. By using middle value of boundary line of water quality grade appraised by traditional biological indexes evaluation as datum point to from the functions of membership,the rationalization and exactitude of this appraisal have been enhanced. The basic method of variousbiological indexes fuzzy composite appraisal has been proposed. A good result has been gotten by using this method to appraise the water quality of Hunjiang reservoir.