In order to verify the water quality condition of coastal water area, some coastal water area was taken as a case study. The improved projection pursuit cluster evaluation model based on principal component analysis method was used to analyze the water quality condition of 13 monitoring points in this coastal waters. The result showed that in the 13 monitoring points in this coastal waters, water quality condition maintained in the first class level accounted for 30. 77%, the second class level accounted for 30. 77% and 38. 46% for the third class level, and monitoring points with no point belonged to the fourth class level. In general, the coastal water quality condition was not good and it was likely to be even worse.%为评估近岸海域水环境质量状况,本文以某近岸海域为例,运用建立的基于主成分分析的改进投影寻踪聚类评价模型对该近岸海域13个监测点的水质状况进行分析。结果表明,13个监测点中,水质状况维持在一类、二类、三类级别的分别占30．77%、30．77%以及38．46%,未有点位处于四类及以上级别。总的来说,该近岸海域水体质量一般,而且还有进一步恶化的趋势。
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