Using a two-phase circulation apparatus, phase equilibrium data at elevated pressures for ternary systems consisting of CO2, C2H5OH and H2O have been measured. A new method for the calculation of liquid phase compositions from P, T, and supercritical fluid phase compositions by the modified Peng Robinson equation is proposed. The applicability of this method is examined for our experimental data and literature data. As a result, it is confirmed that the method can represent the experimental data with good accuracy.