Cyromazine is a kind of insect growth regulator insecticide with low toxicity, which has very strong selectivity and is mainly active to diptera insects. The mechanism of its operation is that the larvae and pupae of diptera are deformed, and the emergence of adults is not complete or inhibited. The drug has the effect of contact and stomach toxicity, and has strong internal absorption conductivity, long duration of efficacy, but the action rate is slow. Myceline has no side effects on human and livestock, and is safe to the environment.