中文摘要：

针对集对分析法对Ⅰ类水质评价较为粗略的问题,本文对该方法进行了改进.采用添加评价Ⅰ类水的系数,将原本联系度同为1的Ⅰ类水再次细分,以使同等级水质区别开.实例分析的结果表明,采用改进的集对分析法进行水质评价,不仅计算更加简便,而且评价结果更加符合实际.

英文摘要：

Since the set pair analysis method used in evaluating the grade Ⅰ water is quite inaccurate,this method has been improved in this paper. Evaluating grade Ⅰ water by adding a factor can reclassify the same grade water,which shares the same contact degreeⅠ,and then the same grade water can be distinguished. The comparative analysis results based on the example calculation show that the improved set pair analysis method can evaluate water quality accurately,not only the calculation is simple,but the evaluation results are more realistic as well.