In order to choose the best insecticide for fruit fly protein hydrolysate baits in field, laboratory tests were taken to assess the stomach toxicity of spinosad and phloxine B with torula yeast protein hydrolysate on oriental fruit flies, Bactrocera dorsalis (Hendel) female and male adults. Median lethal concentration values of spinosad and phloxine B on B. dorsalis male and female adults at 5 h were 12.757 0 mg/kg, 13.953 5 mg/kg; 779.937 8 mg/kg, 826.625 9 mg/kg respectively. Median lethal time of spinosad was 4.190 4 h(females) and 4.973 0 h(males) at 16 mg/kg and 100 mg/kg; The median lethal time of spinosad was 2.487 7 h(females) and 2.675 5 h(males). For phloxine B, at 630 mg/kg the median lethal time was 5.350 7 h(females) and 4.946 2 h(males), and at 1, 000 mg/kg the median lethal time was 4.765 0 h(females) and 4.571 5 h(males). Key words：