The heat generation of highspeed angular contact ball bearing is mainly due to the friction between roller and raceway when rotating at high speed,the rotating speed,load,materials and lubrication condition are the main influence factors. According to the calculation model of rolling bearing heat generation,the heat generation of high speed angular contact ball bearing B7005 with spacecraft is calculated based on computing platform MATLAB.Then,the temperature field simulation analysis is studied based on ANSYS platform. Finally,comparing the results of the two methods,the analysis shows that the finite element analysis results are close to the theoretical calculation. It verifies that the temperature field simulation analysis method has high reliability,and it is the important foundation of the hotstructure coupling and life analysis.