介绍了模拟污染水体中各类指标的单回归分析，逐步聚类分析，主成份分析及逐步判别分析．在聚类图和判别函数中，溶解氧与色度具有最紧密关系．水中总磷和氨氮对水质也有显著影响．对模拟试验样品，主成份分类与判别分析分类的结果相类似，而对城市河流样品用判别函数判别的结果与观察到的天然状态相一致． The single regression analysis, stepwise clustering analysis, principal component analysis and stepwise discriminant analysis of various indicators in simulated polluted water were introduced. In clustering and discriminant functions, dissolved oxygen has the closest relationship with chroma. Total phosphorus and ammonia nitrogen in water also have a significant impact on water quality. For the simulated test samples, the classification of principal components and discriminant analysis are similar, but the judgment of urban river samples by the discriminant function is consistent with the observed natural state.