|The effects of ozone an degradation of pesticides such as carbendazim, captan, diazinon, dichlorvos, chlorpyrifos and fenthion were investigated. Pesticides were treated with 0.3 and 0.5 ppm aqueous ozone for 30 min at 15℃. The pesticides degradation was enhanced 2-fold higher in 0.5ppm aqueous ozone treatment than in 0.3ppm. The pesticides such as carbendazim, dichlorvos, chlorpyrifos, diazinon treated by 0.5ppm aqueous ozone were destroyed to 22, 36, 79%, respectively. And, this ozone treatment caused also 84% destruction of captan, and fenthion, respectively. Pesticides destruction increased significantly with increasing ozone-treatment time.