Abstract: In this paper, the effect of salt on vapor-liquid equilibria for binary solutions is considered to be due to the formation of solvates, thus leading to a model of salt effect from which Furters equation can be deduced. Theparameter of Furters equation is represented by where C1, C2 are the solvation numbers of the two components, Some problems involved in the application of Furters equation were discussed. Experiments on vapor-liquid equilibria at atmospheric pressure for the systems, methanol-benzene-sodium iodide, methanol-carbon tetrachloride-sodium iodide and methanol-cyclohexane-sodium iodide were carried out, showing good agreement with the proposed mechanism and the deduced conclusions.