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对室内选育的淡色库蚊（对溴氰菊酯抗性品系和敏感品系）用浸渍法测定了Ⅱ龄、Ⅲ龄和Ⅳ龄幼虫，用接触筒法测定了早期、中期和晚期成虫；并观察了增效醚（ＰＢ）、磷酸三苯酯（ＴＰＰ）和杀虫脒与溴氰菊酯混用后的增效效果。结果表明：（１）淡色库蚊各发育阶段对溴氰菊酯的抗性水平，在敏感品系由高至低依次为中期、晚期、早期成虫、Ⅳ龄、Ⅲ龄和Ⅱ龄幼虫；在抗性品系则为早期、中期、晚期成虫、Ⅳ龄、Ⅲ龄和Ⅱ龄幼虫。（２）ＰＢ和杀虫脒均有明显增效作用，提示抗性可能与氧化代谢增强和靶标部位不敏感有关。其中似乎幼虫阶段以氧化代谢增强为主要抗性机制；在成虫阶段，氧化代谢增强和靶标部位不敏感性均在抗性中起重要作用
The second, third instar and fourth instar larvae of Culex pipiens pallens (resistant to deltamethrin and susceptible strains) were determined by immersion method, and adults in the early, middle and late stages were determined by the contact method. The synergistic effects of PB, triphenyl phosphate (TPP) and chlordimeform with deltamethrin were observed. The results showed that: (1) The resistance of deltamethrin to Culex pipiens pallens at different developmental stages was mid-, late- and early-stage adult, stage IV, III and II larvae in descending order of susceptibility; Sex lines are early, middle and late adults, Ⅳ, Ⅲ and Ⅱ instar larvae. (2) PB and chlordimeform have significant synergistic effects, suggesting that resistance may be related to enhanced oxidative metabolism and target site insensitivity. Among them, the larval stage seems to be the major resistance mechanism with the enhancement of oxidative metabolism; in the adult stage, the enhancement of oxidative metabolism and the insensitivity of the target part all play an important role in the resistance