A steadystate microscopic thermoelastic grinding wheel model was established to study the hydrodynamic effect of ceramic corundum grinding wheel cylindrical grinding bearing steel(GCr15)based on elastic fluid dynamic lubrication theory.The hydrodynamic effects of ceramic corundum abrasive,diamond abrasive and CBN abrasive under isothermal conditions were compared and analyzed.The effects of thermal effects and the effects of roughness amplitude and wavelength on the hydrodynamic effect of emulsion lubrication were analyzed.The results show that,compared with other grinding wheels,the overall pressure of ceramic corundum grinding wheel is the smallest and the overall film thickness is the largest.The effect of thermal effect in grinding process can not be ignored,when considering the thermal effect,the pressure and film thickness in the grinding zone are reduced.As the roughness amplitude increases,the pressure is increased and the film thickness is decreased.The wavelength of roughness is mainly related to the density of the rough peak,which has little effect on the hydrodynamic pressure and film thickness.