Abstract: The technology of high speed point grinding has been widely used in the equipment manufacturing industry. The real temperature field distribution and the highest temperature could be simulated with loading the moving heat source by considering the effect of the swivel angle α on the heat flow transferred to work-surface, and the thickness of affected layer at the subsurface was also analyzed. The orthogonal test for high speed point grinding with different grinding parameters was designed to get the real surface hardness, which could verify the work-surface temperature field simulation and acquire the sensitivity parameters for surface hardness. The results show that the temperature rise is reduced by introducing swivel angle α, and the cutting depth is the main factor for temperature rise in grinding area; and with the temperature heaving and achieving a certain value, the component's hardening layer will be changed and the hardening effect will be destroyed.