To determine the toxicity and toxic effects of benzoylphenylurea insecticides(BPUs) against Scatopse sp.,impregnation method was used to determine the effects of four BPUs,lufenuron,chlorfluazuron,flufenoxuron and hexaflumuron,on the toxicity, growth, development and reproduction of larvae stage.The results showed that the toxicity of lufenuron and chlorfluazuron to the 2nd instar larvae was relatively high,with LC₅₀ of 2.627 mg/L and 3.791 mg/L,respectively.The developmental duration of 2nd instar larvae and pupal stage were prolonged under the sublethal concentration of four BPUs.The 4th larva stage of chlorfluazuron and lufenuron under LC₄₀ treatment were extended by 2.31 d and 2.11 d respectively,compared with the control(use sterile water instead of liquid medicine). Under LC40 treatment,chlorfluazuron had the strongest inhibition effect on the pupation rate and eclosion rate of 2nd instar larvae,which were 60.56% and 72.56% respectively,and pupation rate and eclosion rate of lufenuron were 65.21% and 76.45% respectively. Chlorfluazuron and lufenuron had significant inhibition effect on the eggs laid per female,which decreased by 41.78% and 37.53% respectively,compared with the control.These results indicate that chlorfluazuron and lufenuron are ideal pesticides against Scatopse sp., the young larvae stage (before 2nd instar larvae) is the best time to use two kinds of BPUs,the inhibition effect of BPUs on the growth,development and fecundity of Scatopse sp can be gave full play.