Isothermal vapor-liquid equilibrium data at three temperatures (39.5, 55.0, and 70.6)degrees C have been measured for the system acetone (1) + methanol (2) + lithium bromide (3) at constant salt molalities (0.500, 1.00, 2.00, 3.00 and 4.00 mol.kg(-1)) with the help of headspace gas chromatography. The experimental data were fitted using the electrolyte NRTL model (Mock et al., 1986), the extended UNIQUAC model (Sander et al., 1986), the electrolyte UNIFAC group-contribution model (Kikic et al., 1991) and the LIQUAC model (Li et al., 1994). The results of correlation were compared with the experimental data. Superior results were obtained for the LIQUAC model.