Abstract: The molecular thermodynamic model for chain like molecule fluids presented in previous work has been extended to the correlation of liquid pVT of binary mixtures and the prediction of the vapor liquid equilibrium of ternary mixtures. It is shown that this model can be used to correlate the liquid pVT of binary mixtures with adjustable temperature independent interaction parameter in large temperature and pressure ranges. Good agreement can also been obtained between calculated vapor liquid equilibria for ternary mixtures of normal fluids without association and experimental data.