Prediction method of permeation flux and sorption characteristics in pervaporation through a polydimethylsiloxane(PDMS) memrane was suggested. The amount of sorption and permeation flux of chloroform, toluene, methanol and n-butanol were calculated with this method and compared with this method and compared with experimetal data. The calculated values of permeation flux and the amount of sorption of good solvents, that is, toluene and chloroform were well agreed with the experimental data. The lower the density of PDMS membrane is, the more permeation flux and sorption quantity were increased. However, the experimental data of poor solvents, that is, methanol and n-butanol were no so well agreed with the calculated values. It is shown that the prediction method suggested in this study may be used without experimetnal for the prediction of permeation flux and sorption quantity of the good solvent on PDMS membrane.