The mathematical model of angular contact ball bearing was established. Through solving the Reynolds equation considering thermal effect,the elastohydrodynamic lubrication(TEHL) for angular contact ball bearing was simulated, and a full numerical solution was acquired. The effect of geometric parameters (such as contact angular, alignment, radial clearance), velocity and load on pressure and film thickness when considering thermal effect was discussed. Result show that when designing angular contact ball bearing, the alignment in the radial direction of the inner ring and ball should be improved to form the lubrication film effectively, and by choosing smaller pitch diameter, the bearing lubrication can be improved. The proper sphere diameter can make the pressure, film thickness and temperature of the bearing in a suitable range, and raising the bearing speed moderately is beneficial the formation of the lubrication film.