Chlorbenzuron is a benzoylurea insect chitin synthesis inhibitor and an insect hormone pesticide. By inhibiting the activity of insect epidermal chitin synthase and uridine coenzyme, the synthesis of insect chitin can be inhibited and the insect can not molt normally and die. Affect the respiratory metabolism of eggs and the DNA and protein metabolism during embryonic development, so that the larvae in the eggs lack chitin and cannot hatch or die immediately after hatching; application in the larval stage will hinder the formation of new epidermis of the pests, delay development, or lack Hardness, failure to molt normally and lead to death or formation of deformed pupae. It shows good insecticidal activity to abnormal insects, especially Lepidoptera larvae.