Fenpropathrin is a pyrethroid insecticide and acaricide with a chemical formula of C22H23NO3. It is moderately toxic. It has contact and stomach toxicity and has certain repellent effects. It has no systemic or fumigation effects. Its chemical name is α-cyano-3-phenoxybenzyl-2,2,3,3-tetramethylcyclopropane ester. It was named Fenpropathrin after it was approved by the British Standards Institution in 1978. It is a neurotoxic agent. In the nervous system of insects, the insects are over-excited, paralyzed and die. The medicine has a wide insecticidal spectrum, a fast knockdown effect and a long lasting period. Its biggest feature is that it has a good control effect on many kinds of pests and a variety of spider mites at the same time, and is especially suitable for use when pests and harmful mites are concurrent.