利用室内选育的抗杀螟丹小菜蛾Ｐｌｕｔｅｌａｘｙｌｏｓｔｅｌａ（Ｌ）品系和敏感品系研究了该品系的抗性遗传形式，结果表明，小菜蛾对杀螟丹的抗性形式为常染色体多基因遗传，并呈不完全显性。该品系对６种常用杀虫剂的抗性谱测定结果表明，对杀虫双有较严重的正交互抗性；对敌敌畏、杀扑磷有低度交互抗性；对溴氰菊酯、灭多威和叶蝉散等药剂无交互抗性。还发现该品系对杀螟丹的抗性与乙酰胆碱酯酶和羧酸酯酶活性无关。 The resistant genetic forms of Plutella xylostella (L.) resistant to diamondback moth, Plutella xylostella (L.), which were bred in laboratory, were studied. The results showed that the resistant forms of Plutella xylostella to Cartap are autosomal polygenic inheritance, And was not completely dominant. The results of resistance spectrum analysis of the six commonly used insecticides show that the strain has more serious cross-resistance to insecticidal double-insecticide, low-level cross-resistance to dichlorvos and trimethoprim- Dorway and leafhopper and other agents without cross-resistance. The resistance of the line to cartap is also found to be independent of acetylcholinesterase and carboxylesterase activities.