Isothermal vapor-liquid equilibria (VLE) and excess molar enthalpies (H (E)) at 323.15 K were measured for the binary mixtures of dimethyl ether (DME) with C-1 to C-4 alkan-1-ols. The measured VLE and H (E) data were correlated well with G (E) model equations and Redlich-Kister polynomial, respectively. Additionally liquid-liquid equilibrium (LLE) for the ternary system of DME + methanol + water was determined at 313.15 K. The measured LLE data were compared with the correlated values by using NRTL and UNIQUAC models, and they showed good agreements.