There are many methods to evaluate water environment quality. The gray relation method mainly reflects the correlation degree between sample and environmental criterion.
用于水环境质量评价的方法较多，而灰色关联分析法主要体现的是待评价样本与环境质量分级标准在整体上的关联程度。
Methods Based on statistical data of Shaanxi Province from 1999 to 2004, the grey correlation degree analysis is used.
方法基于陕西省1999—2004年的统计数据，运用灰色系统理论中的相对关联度分析方法。
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