An observation on phytoplankton abundance and environmental factors was made in Xingkai Lake in July-October 2007 and May 2008. The correlation between phytoplankton abundance and environmental factors was analyzed based on gray relational analysis. Results showed that the phytoplankton abundance was highest in summer, followed by fall and spring. The spatial distribution indicated that the phytoplankton abundances in No. 3 sampling site were highest in spring and autumn, and that in No.5 sampling site was highest in summer, while the lowest phytoplankton abundances were found in No. 10 sampling site in spring, No. 8 sampling site in summer, and No. 11 sampling site in fall. The result of grey relational analysis suggests that the environmental factor obviously influencing phytoplankton is turbidity.%2007年7月份、10月份和2008年5月份,对兴凯湖浮游植物丰度及其环境因子进行监测,并运用灰色关联分析方法对浮游植物丰度与环境因子关系进行相关性分析.结果表明,兴凯湖浮游植物丰度时间分布以夏季最高,秋季次之,春季最低；空间分布表现为春季以3#采样点最高,10#采样点最低；夏季最高为5#采样点,最低为8#采样点；秋季最高为3#采样点,最低为11#采样点.灰关联分析结果表明,对兴凯湖浮游植物丰度影响最大的环境因子是浊度.
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