A novel composite membrane of micron PTFE powder filled PDMS was prepared for the pervaporation of organic components （ethanol, 1-propanol and acetone） from water. The physical structure of this kind of composite membrane was investigated by SEM, FTIR and TG. The solubility for organic components （ethanol, 1-propanol and acetone） in the composite membrane was achieved. The results showed that the addition of PTFE from 0 to 10 G in PDMS membrane increased the surface area and thermal stability of PDMS membrane as well as the solubility of above organic components from 0. 0923 to 0. 0991 g/g, from 0. 1589 to 0. 1678 g/g and from 0. 2691 to 0. 2773 g/g respectively, and also the pervaporation of this PDMS membrane.%制备了聚四氟乙烯（PTFE）超细粉体填充聚二甲基硅氧烷（PDMS）复合膜，通过扫描电子显微镜、傅里叶变换红外光谱仪、热失重分析仪等测试仪器对复合膜进行了表征，利用低浓度有机物（乙醇、丙酮、正丙醇）水溶液体系进行渗透汽化，并由单组分溶解实验计算了有机物（乙醇、丙酮、正丙醇）在复合膜中的溶解度。结果表明，PTFE含量由0增加至10％（质量分数，下同）时，复合膜的表面积及热稳定性得到了提高，有机物乙醇、丙酮、正丙醇在复合膜中的溶解度分别由0．0923、0．1589和0．2691g／g提高至0．0991、0．1678和0．2773g／a；加入PTFE后提高了复合膜的渗透汽化性能。
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