According to the typical sliding /rolling contact conditions of the bearings and gears used in aerospace engines,the uneven heat partition in lubricated sliding/rolling contact pairs under high speed and heavy load was investigated.The heat partition coefficient，defined as the ratio of the frictional heat transferred into the disk at higher linear velocity to the total frictional heat,was determined by numerically calculating and experimental testing of the temperature on sliding/rolling contact surfaces.The numerical model was solved using CrankNicolson implicit finite difference method.The temperature on both contact surfaces was calculated using different heat partition coefficient and compared to the surface temperature got from typical experiments.The heat partition coefficient was consequently determined when the surface temperature from both calculations and tests were closed to each other.The temperature of lubricated M50 steel sliding/rolling contact pairs under high speed and heavy load was calculated using the heat partition coefficient,and was verified by the temperature of the sliding/rolling contact surface that was tested using twodisk test rig.The results show that the calculation of heat partition coefficient at the sliding/rolling contact pairs is reasonable and can be used to predict the temperature on the contact surface of lubricated M50 steel sliding/rolling contact pairs under high speed and heavy load. 