<正>用比较频次法、聚集度指标法、ｌｗａｏ与Ｔａｙｌｏｒ的回归分析法，在国内首次对杉木球果麦蛾幼虫和蛹的空间分布型进行研究。结果表明幼虫和蛹均为聚集分布。并用Ｂｌａｋｉｔｈ提出的＂聚集均数＂法对聚集原因分析表明，幼虫和蛹的聚集均与其栖境有直接关系。生物学特性的作用只能通过种群密度的变化表现出来。

The present paper deals with the spatial distribution patterns of Dichomer sp. in the seeds yard of cunninghamia lanceolta. Frequency check methods、regression analysis and several aggregation indices were used to determine the spatial distribution patterns. All larval and pupa were of aggregated patterns. Also, the ’aggregation average’ method by Blackith was used to analyse the aggregated reasons of larval and pupa. All larval and pupa were related to their environment; but the function of biological characters only occured with the changing of POPulation density.