The experiments of singlefactor evaluation method, principal component analysis and voronoi area weightingfactor method on the sample data of Liangzi Lake in October 2012 combined with thenational surface water environment quality standards can get the map of comprehensivewater quality distribution by Kriging interpolation. The analysis shows, the gradesof comprehensive water quality gained by three methods are all only class III orclass IV, and the quality of water is different from east and west that the waterquality of east is better. However, the percent of IV class water is higher in theresult of single factor evaluation method means class IV is the main grade of waterquality. The result of principal component analysis shows the percent of class Ⅲ water is higher than other classes.The result of voronoi area weighting factor method shows the percent of IV classis higher than other classes. CODMn is the main factor that influencesthe method of singal factor evaluation and reduces the grade of water quality overall.The effect of single factor is reduced by principal component analysis, and theanalysis on water quality is more accurate. The voronoi area weighing factor methodreduces the effect of single factor and extends the content, can make a comprehensiveevaluation on water quality.
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