Hydrophobic polydimethylsiloxane（PDMS）/ceramic composite membrane was prepared and used in the pervaporation of simulated fermentation components.The effects of the common components in ethanol fermentation;such as glucose（polyhydric aldehyde）;glycerol（organic polyol）;succinic acid（organic acid）and KCl（inorganic salts）;on the pervaporation performance of the composite membrane were investigated in detail.The results show that the addition of organic components to the 65 g·L-1 ethanol-water solution has little effect on the pervaporation performance while the addition of inorganic salts（KCl）made a little improvement of separation factor.The PDMS/ceramic membranes exhibited stable performance in these ternary systems with a high flux of 4.5—4.7 kg·m-2·h-1 and an acceptable ethanol/water separation factor of 8.3—10.3 at 333 K.