Abstract: Due to the efficient process property,metal bonded diamond arc grinding wheel has been employed in the process of the large aperture SiC china gradually. However,the amount of consumption limits its application.To eliminate consumption of the grinding wheel,the paper proposes electrodischarge machining(EDM)to dress metal bonded arc grinding wheels and makes some single factor experiments of voltage,current,pulse frequency for grinding wheel of 50-63 μm grain size.The relationship between different electric factors and grinding wheel surface is inspected by super depth field microscope,as well as the relationship between surface removal quantity and electric factors.It is shown that in condition of voltage 60 V,pulse frequency 25 kHz and multiple channel current,better quality of grinding wheel surface could be achieved.