According to the elliptical contact theory , obtained disc wheel basic grinding parameters of gear grinding surface and established finite element model, and using the rectangular distribution of heat for the gear grinding thermal simulation, obtained the grinding temperature field. The results showed that the temperature variation law of the saucer wheel grinding is : along the direction of tooth proximal near heart and along the direction of tooth height relatively close to the root area, the grinding temperature gradually increased. Meanwhile using infrared thermometer to measure actual grinding temperature, compared the measured temperatures with the finite elemental analysis results, found that the error analysis results of all the grinding points were between 20% and 5%, and the higher the temperature, the smaller the error was, verified the feasibility of the ellipse contact theory in the surface gear grinding thermal research.