本文研究了赛丹及其代谢物在烟草中的分析方法及在烟叶、土壤中的降解规律。采用气相色谱法（ Ｅ Ｃ Ｄ）测定。赛丹 ３ 种异构体的最小检知量和最低检出浓度分别为：α１３×１０１１ｇ、β１５×１０１１ｇ、ｅｎｄ３×１０－ １１ｇ，α６×１０４ｍ ｇ／ｋｇ、β１１×１０－ ３ｍ ｇ／ｋｇ、ｅｎｄ２４×１０－ ３ｍ ｇ／ｋｇ。回收率均在 ８２４４％ ～１０１％ 之间，变异系数均在１１％ ～６２％ 之间。测得最终干烟叶中１０ｄ 的样品残留量平均为８８３ｍ ｇ／ｋｇ，１５ｄ 的样品残留量平均为４４７ｍ ｇ／ｋｇ。赛丹在烟草中降解规律为前期较快，后期相对较慢，在鲜烟叶中半衰期只有１ｄ 左右，在土壤中半衰期为１０ｄ 左右，６０ｄ 的最终残留量平均为 ００６ｍ ｇ／ｋｇ，对土壤不会造成环境影响。 In this paper, the analytical methods of Sidan and its metabolites in tobacco and the degradation rules in tobacco leaves and soil were studied. Gas chromatography (E C D) was used. Saida Dan 3 isomers of the minimum detection and detection of the minimum concentration were: α 1 3 × 10 11g, β 1 5 × 10 11g, end 3 × 10-11g, α 6 × 10 4m g / kg, β 1 1 × 10-3m g / kg, end 2  4 × 10-3m g / kg. The recoveries ranged from 8244% to 101%, and the coefficients of variation were all between 11% and 62%. The average final residue of 10 days in the final dried tobacco was 883 m g / kg, and the average residue in 15 days was 447 m g / kg. The degradation of Sialin in tobacco was fast in the early stage and relatively late in the late stage. The half-life in fresh tobacco was only about 1d, the half-life in soil was about 10d, and the final residue on 60d was 0.06m g / kg. Will not cause environmental impact.