Kui River is an important river in Xuzhou .In recent years ,the pollution of the river is more serious because of the free discharge of sewage and industrial wastewater .In this paper ,the water quality of the 7 monitoring sections of the Kui River (Xuzhou section) was analyzed ,and the statistical analysis was carried out using the cluster analysis and principal component analysis .The results showed that :(1)the turbidity value of seven monitoring sections changed from1 .05 to 1 .99NTU ,pH 7 .23~7 .83 ,dissolved ox‐ygen 0 .48~2 .98mg/L ;(2)higher content of COD ,T P and nitrate nitrogen ,seven section overall belonged to class V~inferior V class of water ;(3)clustering analysis showed that seven section could be divided for urban and rural combination section and rural section;(4)principal component analysis showed that eu‐trophication problem of Kui River was serious and the phosphorus was the main pollution factor ,organic matter and nitrogen pollution was also serious .%奎河是徐州境内一条重要的河流．因近年生活污水、工业废水的随意排放，奎河水体的污染问题愈发严重．文章分析了奎河（徐州段）7个监测断面的水质基本情况，并采用聚类分析和主成分分析对监测断面和水质指标进行了统计分析．结果表明：1）七个监测断面的浊度值的变化范围1．05到1．99NTU，pH值的变化范围为7．23～7．83，溶解氧的变化范围在0．48～2．98mg／L ；2） DO、TP和硝酸盐氮含量较高，7个断面总体属于V类～劣V类水；3）聚类分析表明7个断面可以分为城区‐城乡结合部以及农村段两大类；4）主成分分析表明，奎河富营养化问题严重，磷是首要污染因子，有机物和氮污染也较为严重．
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