Cypermethrin is highly toxic to fish, the LC50 (96 hours) for rainbow trout is 0.00015mg/L, and the LC50 (48 hours) for Daphnia is 0.00016mg/L. However, because the agent has a high affinity in the soil and its water solubility is low, the actual impact is relatively small. This agent is moderately toxic to bees and highly toxic to silkworms. High insecticidal activity, mainly contact and stomach poisoning, no systemic and fumigating activity. Its action is rapid, the duration of effect is long, and the insecticidal spectrum is wide.