In this paper, the composite membrane of polydimethylsiloxane(PDMS)/polyvinylidene fluoride (PVDF) is prepared by cross-linking reaction of PDMS and triethoxyvinylsilane on PVDF hollow fiber membrane surface.Themembranesare characterized with scanning electronmicroscopyandattenuated total reflection Fourier transform infrared spectrum.Thepervaporation performance is investigated by separation of three simulate saline organic wastewaters, n-butanol-water, isopropanol-water and acetone-water, the effect of temperature on membrane separation performance is also determined. The results show that the membranes have good performance for separation of three saline organic wastewaters, when the operating temperature is 40 oC, the membranes exhibit the permeate flux of 275.95 g/m²·h,322.16 g/m²·h,489.76 g/m²·h, and separation factor is 37.82,12.60,33.12, respectively.