[目的]开发安全环保的5%三氟氯氰菊酯水乳剂。[方法]采用相转移法,对溶剂及表面活性剂进行筛选,确定5%三氟氯氰菊酯水乳剂的最优配方。[结果]最优配方:三氟氯氰菊酯5%,溶剂二甲苯10%,602#乳化剂6%,OP-10-P乳化剂2%,乙二醇5%,消泡剂0.1%,水补足。经常温、热贮(54±2)℃,14 d未出现析油、分层现象,有效成分分解率<5%,制剂黏度小。[结论]5%三氟氯氰菊酯水乳剂各项指标均符合水乳剂的要求,具有良好的开发前景。 [Objective] To develop a safe and environmentally friendly 5% cyhalothrin emulsion. [Method] The phase transfer method was used to screen the solvents and surfactants to determine the optimum formula of 5% cyhalothrin emulsion. [Result] The optimal formulation was: cyhalothrin 5%, solvent xylene 10%, 602 # emulsifier 6%, OP-10-P emulsifier 2%, ethylene glycol 5%, defoamer 0.1% . At room temperature, heat storage (54 ± 2) ℃, 14 d did not appear oil separation and delamination phenomenon, the active ingredient decomposition rate was less than 5%, the preparation viscosity was small. [Conclusion] All the indexes of 5% cyhalothrin emulsion were in accordance with the requirements of water emulsion and had good development prospect.