在野外稻田－鱼塘模拟系统研究了乙氧氟草醚以规定剂量７２ｇ／ｈｍ２施用于田间后的残留分布及消解动态。结果表明，施药后４ｈ该药在稻田表水和鱼沟中的浓度分别为２９４和１９６μｇ／Ｌ，在稻田土、鱼塘水和塘泥中的最大浓度分别为０７５２，０００６和０１５６ｍｇ／Ｌ。且在各介质中消解迅速，在田表水、塘水、田土中的半衰期分别为４５，４８８ｈ和７２ｄ。说明该药对水生生物虽有较高毒性，但在规定使用剂量下，其在稻田及邻近鱼塘中的残留浓度与毒性已降到对其中的水生生物不再有危害的水平。因此可认为该农药在稻田使用对水生生物无实际危害作用。 In the paddy field-fish pond simulation system in the wild, the residue distribution and digestion dynamics of oxyfluorfen at the dosage of 72 g / hm2 were studied. The results showed that the concentrations of this drug in surface water and fish ditch at 4 h after spraying were 294 and 196 μg / L, respectively, and the maximum concentrations in paddy soil, pond water and pond mud were 0752 , 0006 and 0156 mg / L. And quickly digested in each medium. The half-lives in field water, pond water and field soil were 45,488h and 72d, respectively. Indicating that the drug is highly toxic to aquatic organisms, but its residual concentration and toxicity in paddy fields and adjacent fish ponds have been reduced to levels no longer endangering the aquatic organisms at the stated doses. Therefore, it can be considered that the use of pesticides in paddy fields has no practical impact on aquatic organisms.