The Martin-Hou (M-H) equation of state with the modification by Hou was applied to correlate the excess enthalpy of binary gaseous or liquid systems. 144 sets of data for the excess enthalpy of 19 binary gaseous systems and 39 sets of data for the excess enthalpy of 22 binary liquid systems were correlated. The results were satisfactory. In this work, the M-H equation was also applied to predict isothermal binary vapor-liquid equilibrium data from the excess enthalpy data.