Abstract: Aiming at the problems of low machining accuracy and poor surface quality of CRMN bearing steel used in bearing raceway processing, this paper proposed a precise progressive grinding removal processing method based on the grinding principle and ELID grinding mechanism. An experimental study on precision progressive grinding removal process of CRMN bearing steel was carried out by using the quadratic general rotation combination method. A mathematical model was established for the relationship between the grain size, abrasive concentration, grinding wheel linear velocity and the machining accuracy of single cutting wheel. Through the established mathematical model, according to the LINGO software and the existing ELID grinding experience, the optimal combination of the ELID grinding process parameters of bearing steel was obtained. Using W40 and W10 iron-based grinding wheels, precision and ultra-precision machining were carried out on bearing steel surface with machining allowance of 15 μm, respectively, and Ra61 nm and Ra16 nm precision and ultra-precision machining surface were obtained. It is verified that when the machining allowance is constant, ELID grinding can achieve stable precision progressive grinding removal of machining allowance.