During the operation of a refrigeration compressor,the refrigerant will dissolve part or all into the refrigerant oil under certain pressure and temperature.The antiwear performance of the refrigerator oil mixed with refrigerant extremely dependents on the miscibility characteristics between refrigerant and refrigerator oil.A method of determining antiwear performance of refrigerator oils mixed with refrigerant was presented,and the optimum parameters for evaluating the antiwear properties of refrigerant oil mixed with refrigerants were determined through the ringblock friction test.The test results show that the proposed evaluation method has a good distinction for different types of refrigerant oils,and different synthetic oils and mineral oils,and can be used for the screening of refrigerant oil products and the development of new products.