By treating salt as one kind of solvent

eighteen sets of vapor pressure data of salt-containing systems have been correlated with Wilson

NRTL and modified UNIQUAC models. The maximum likelihood method based on maximum liklihood principle was used in correlation. Satisfactory results were obtained for all the three models. The optimum parameters thus obtained were used to predict five sets of VLE data for multicomponent salt-containing systems reported in literature. The predicted results show that the precision with NRTL model is a little better than with the other models; and is comparable with "pseudo binary approach".