Abstract: The toxicity of 0.3% Azadirachtin emulsion comentration and Verticillium lecanii to Amblyseius cucumeris Oudemans were tested.The results showed that 0.3% Azadirachtin emulsion comentration had some toxicity to Amblsyseius cucumeris Oudemans.The LC50 to Amblyseius cucumeris Oudemans was 5.01 mg·L-1 regression linear equation was y=1.2294x+0.526.But it showed no toxicity to Amblyseius cucumeris Oudemans after Amblyseius cucumeris Oudemans eat the citrus spider mite that were treated by 0.3% Azadiraehtin.And Verticillium lecanii also had no toxicity to Amblyseius cucumeris Oudemans.So adopting 0.3% Azadirachtin and Verticillium lecanii to control green leaf hopper,citrus pest mite,citrus white fly.citrus scale,aphid and other pests.not only acquirc better control effects but also protect the natural enemies—Amblyseius cucmeris Oudemans.