Abstract: Field efficacy trials of mixed 6% spinetoram and bacillus thuringiensis on diamondback month were conducted. The results showed that the contorl velocity and persistence of mixed 6% spintoram SC and 32 000 IU/mg bacillus thuringiensis WP on diamondback moth per 667 m² was better than that of applying 30 mL 6% spintoram SC alone, and the control persistence was better than that of applying 45 mL 6% spintoram SC alone; Meanwhile, the mixed system was proved safe in controlling diamondback moth in field production. Mixed 30 mL 6% spintoram SC and 30-45 g 32 000 IU/mg bacillus thuringiensis WP per 667 m² was recommeded.