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根据北部湾“908专项”于2006-2007年4个季节的调查数据，分析了北部湾北部浮游动物的种类组成及影响种数时空变化的环境因素。研究结果表明，北部湾北部浮游动物共计鉴定370种，隶属于8个门，19个类群。水螅水母类和桡足类是优势类群。种数变化呈如下从大至小的顺序为夏季、秋季、春季、冬季的单峰型季节性特征。种数平面分布与水深变化有关，种类数随水深的增加而增多。广温广盐类群和近岸低盐类群在该海域占据主导地位，与少数的河口类群及大洋类群形成北部湾北部特有的浮游动物群落组成结构。该海域在春季出现的暖温带种类由粤西沿岸经琼州海峡过道水带入本调查区。影响种数的环境因素呈季节性变化。地形特征、海流与水团的消长及浮游植物的生长与繁殖是影响浮游动物群落组成和水平分布推移的重要因素。“,”The species composition of zooplankton in northern Beibu Gulf was studied based on the samples of Beibu Gulf collected during 2006-2007 .The environmental factors which affected the number of species were also ana-lyzed .The study showed that a total of 370 zooplankton taxa were identified ,which belonging to 8 phyla ,19 Tax-a .Hydromedusae and Copepoda were dominant taxa .The species number of zooplankton ,varied seasonally ,was highest in summer ,followed by autumn ,spring and winter .The distribution characteristics indicated that there was a gradual increase in the species number from shallow water to deep water .The wide-temperature-salinity group and the neritic low-salinity group which were dominant in this area formed a uniquely northern Beibu Gulf zooplankton community composition structure with few estuarine group and oceanic group .The temperate group appeared in spring might be brought in Beibu Gulf from neritic Guangdong by Qiongzhou Strait .The environmen-tal factors which affected the number of species were varied during four seasons .Topographic feature ,currents and water masses ,phytoplankton were the main factors on zooplankton composition .