Emamectin benzoate has a role in touching to kill and stomachtoxicity, its mechanism is to interfere with pests’neurophysiological activity, impede pests’ information transmissionof motor nerve, stimulate the release of r-aminobutyric acid. Afterpests are in touch with the pharmacy, it appears pharmaceutical paralysis symptoms, no activities and no feed andwill be dead after 2-4 days. The product has good effect oncruciferous vegetables.