PDMS(Polydimethylsiloxane)/ceramic composite membrane was used in pervaporation process in order to enhance the flux with maintaining proper selectivity. In pervaporation of IPA(Isopropanol) from aqueous IPA solution, selectivities of IPA decreased and fluxes increased with concentration of IPA in feed mixtures. in removal of IPA from aqueous IPA solution by using PDMS/ceramic composite membrane, selectivities of IPA increased with operating temperature in the range from 0 to 20wt% of IPA, in feed mixtures. This phenomenon could be explained in terms of coupling effects between permeant and composite membrani and between permeants. Among these effects, capillary condensation could be importantly considered due to hydrophilicity and porous structure of ceramic support. In order to investigate the effect of ceramic support on pervaporation characteristics, pervaporation with homogeneous PDMS membrane without ceramic support was carried out with the same feed mixtures. In the case of non-support membrane, the selectivities of IPA decreased with operating temperature in all the concentration range of IPA in feed mixtures.