In this paper, the rotational composite design of quadraticregression was used to study the effects and interactions of four factors (the number of parasitoids released ,the density of host eggs, the size of searching patch and the size of the crops) on parasitism of Trichogramma pretiosum to the eggs of the diamondback moth(DBM), Plutella xylostella in the field. It was showed that the number of parasitoids released , the size of the crops and the size of searching patch influenced parasitism significantly in turn. The density of host eggs had only minor effect on parasitism. Interaction between the number of parasitoids released and the size of the crops was the most dominant factor among interaction of different factors affecting parasitism of T. pretiosum. T. pretiosum had a strong searching capacity to the egg of DBM, but there existed interference between individuals. Based on the data a quadratic regression parasitism model of T. pretiosum to the eggs of DBM was constructed.%应用二次正交旋转组合设计方法，以小菜蛾卵作为目标寄主卵，在室内模拟研究了赤眼蜂蜂量、寄主卵密度、搜索空间大小和植株体积与短管赤眼蜂寄生率的关系.结果表明，赤眼蜂蜂量是影响短管赤眼蜂寄生率的主因素，植株大小、搜索空间也对寄生率形成极显著的影响，寄主卵量则对寄生率没有任何影响；因子之间的交互作用对寄生率的影响以蜂量和植株大小的交互作用最大，其次是蜂量与寄主卵量、寄主卵量与植株大小的交互作用.短管赤眼蜂对小菜蛾卵有较强的寄生率，且短管赤眼蜂之间存在相互干扰现象.在此基础上建立了短管赤眼蜂对小菜蛾卵寄生率的二次回归模型.
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