Abstract：In order to reduce the test time of MMP, according to the principle of interfracial tension disappearing, a new experimental method which is able to quickly determine the MMP is developed. In the experimental method, the main equipment is a rotatable high pressure piston-typed sample preparation container. In order to determine the MMP, the pressure when the oil is mixed with CO2 is measured. Using the test method of two-phase contact process, the CO2 MMP of reservoir oil in Chang six of Huaqing has been measured. Comparing with the test result of slim tube test, the MMP result based on two-phase contact process is very closed to the result based on slim tube test. The test method of two-phase contact process possesses features of both simple operation and short test time period.