Abstract: Degradation of flufiprole in water via various mechanisms,hydrolysis and photolysis,and in 3 different types of soil was investigated under laboratory conditions.Results show that flufiprole is rather stable and not easy to break down in acid and neutral solutions,but easily gets hydrolyzed in alkaline solution with half-life being 26.7 d in solution 9.0 in pH and 50 ℃ in temperature.Through identification of its hydrolytic products,it could be inferred that the hydrolysis of flufiprole in water is alkali-catalyzed one.Under the artificial light of a Xe lamp,2500 lx in light intensity and 25 μW·cm^-2,flufiprole has a half-life of 1.5 hour,and its photolytic produce was mainly fipronil.But in the paddy soil of Taihu,red soil of Jiangxi and fluo-aquic soil of Shaanxi,flufiprole was found almost unchanged after 180 days of incubation,suggesting that flufiprole is hard to break down in soil.