Selective predation of Cantheconidea furcellate Wolff on the 2nd instar larvae,4th instar larvae and the 6th instar larvae of spodoptera litura in coexistence of three prey-age types was studied.The quadratic function models,describing the relationship between the number of prey attacked and the densities of predator and its preys,were established by the rotational composite design of quadratic regression.Based on the predation models,the selective preying ratios could be calculated under the combination of the different densities of three prey-age types and the predator.%应用二次回归通用旋转组合设计探讨了叉角厉蝽与斜纹夜蛾低龄幼虫、中龄幼虫和高龄幼虫共存系统中，天敌对猎物不同年龄等级的选择捕食作用，建立了3个年龄等级的幼虫被捕食量模型。根据被捕食量模型可计算出斜纹夜蛾3个年龄等级不同密度组合下，天敌对猎物的选择捕食比率。结果表明，在3个年龄等级相同密度的组合下，叉角厉蝽倾向于捕食个体大的中高龄幼虫。
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