The isothermal vapor-liquid equilibrium (VLE) data, the excess molar enthalpy (h^E) and the excess molar volume(V^E) of binary liquid mixtures of methyl tert-buthyl ether (MTBE) with methanol and ethanol were reported. The VLE data were measured at 313.5K using head space gas chromatography and h^E data were measured at 363.15K by means of an isothermal flow calorimeter. The V^E data were also determined at 298.15K with the densities which were measured by a vibrating tube densitometer. The experimental data were correlated with some g^E models or empirical polynomial.