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对甜菜夜蛾幼虫种群的空间分布型进行了研究，１３组样本中有１１组符合负二项分布，２组属聚集分布，所有样本均不符合泊松、奈曼（ｎ＝０～４和∞）、泊松二项、复合泊松分布。利用甜菜夜蛾幼虫种群空间格局参数，估计了个体群平均大小及其平均密度的关系，通过对１～６龄幼虫的分析，１～４龄幼虫为聚集分布，５～６龄幼虫为泊松分布，个体群平均大小指数（Ｌ）随幼虫龄期增大而逐渐减小。
The spatial distribution patterns of the beet armyworm larvae were studied. Among the 13 samples, 11 groups were negative binomial distribution and 2 groups were aggregated distribution. All the samples did not fit Poisson, Neyman (n = 0 ~ 4 and ∞), Poisson binomial, compound Poisson distribution. Based on the spatial pattern parameters of beet armyworm larvae population, the relationship between the average size of individual individuals and their average density was estimated. According to the analysis of 1st to 6th instar larvae, the first to fourth instar larvae were clustered and the fifth to sixth larvae were Poisson Distribution, the average size index of individual groups (L) with the larvae age increased gradually decreased.