Aimed at the existing problems of seawater quality evaluation, a plan has been established, in which first is to determine the weight relationships among various water quality indexes by using principal component analysis, then to classify the samples according to the weight relationships and the water quality classification criteria, and last to establish a discriminant function by discriminant analysis and to realize the water body classification automatically. Good results have been obtained from the application of the plan for the seawaters off western Guangdong. The returned discriminant result of the water body classification reaches to a high compliance rate of 91. 4%. Based on the automatic classification, thematic maps of water body distributions during the period from 2008 to 2010 have also been plotted for the seawaters off western Guangdong, which could provide a decision basis for the pollution control in this sea area.%针对海洋水质评价问题,建立了一套先利用主成分分析法明确各水质指标权重关系,继而参考权重关系依照海水水质分类标准建立分类样本,最终通过判别分析方法建立判别函数实现水体自动分类的方案.该方案在粤西海域,水体分类回判符合率达到91.4％.依据自动分类结果绘制了粤西海域2008-2010年水体分布专题图,为粤西海域环境污染防治提供了决策依据.
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