At present, most of the acaricides produced domestically or abroad are old varieties which mainly comprises propargite of sulfurous ester, kelthane of diphenyl carbinol, azocyclotin and fenbutatin xoide of organotin, pyridaben of heterocyclic compound and isocarbophos of organophosphorus, etc. Due to being used for a long time, the old varieties generate serious drug fastness in most regions and can be effective when being used in high dose. Therefore, the old varieties cannot satisfy the demands of market, and a new acaricide is needed to solve the problem. By aiming at the action of acaricides and combining the characteristics thereof, a novel acaricide of phenoxy pyrazoline esters is developed by the researchers of our company, that is fenpyroximate, which has the action of contact poisoning, and special effects on the egg, young acarids, nymph, adult acarids of acarids in every development phase, and can simultaneously and effectively treat plant diseases and insect pests such as diamondback moth, prodenia litura, Chilo suppressalis, rice fulgorid, barley powdery mildew, oat crown rust, and downy mildew of cucurbits, etc.