Under actual working conditions, heat is mainly generated by the friction among the various components of the bearing ,and lubricant can also generate some.That heat causes bearing system temperature high, severely reducing the accuracy and life of the bearing system. To solve this problem, firstly a resonable model about heat spread in the system was bulit , then bearing outer ring was selected for the analysis. For the example of deep groove ball bearing outer ring , some results about temperature distribution of the bearing outer ring were gotten when the speed and radial load force were changed. In the software Woekbech solution, the bearing outer ring temperature distribution was not a one-dimensional field,but radial dimension and circumferential angle were involved. In the experiment, as the speed and radial load bearing force change, the bearing outer ring temperature data was acquried.when the bearing system temperature was stable , a temperature difference arosed along the circumferential direction, the temperature near the loading zone was slightly higher, the maximum temperature difference reached 1.6 ℃. Finally, simulation and experimental data error was controled in less than 5%.