本文研究了以ＦｅＣｌ３为显色剂，用可见分光光度法测定杀鼠新玉米毒饵中杀鼠新的含量，选定丙酮为毒饵的萃取溶剂，萃取时间３５小时，５分钟显色时间，最大吸收波长４９２纳米。杀鼠新在００２～０２０毫克／毫升范围内呈良好的线性关系，检出下限为０００５７毫克／毫升。考查了不同毒饵添加剂对本分析方法的干扰。实验证明，本方法经济简便，准确性及重现性均良好，利于普及和应用。 In this paper, FeCl3 was used as color reagent to determine the new content of the killer in the nebulize new corn bait by visible spectrophotometry. Acetone as bait extraction solvent was selected. The extraction time was 3.5 hours and the color development time was 5 minutes. The maximum absorption wavelength of 492 nm. Kill mice new in 0.02  0  20 mg / ml showed a good linear relationship between the detection limit of 0  0057 mg / ml. The effects of different bait additives on this analytical method were examined. Experiments show that the method is simple, economical, accurate and reproducible, which is good for popularization and application.