Abstract: Metal fund rigid stone grinding wheel (metal grinding wheel) with the characteristics of strong grit holding, good wear resistance, abrasion-resistance and long service-life, and withstand large grinding pressure, etc., it is widely used in high performance hard and brittle materials precision, ultra-precision and efficient grinding. As a typical high hardness composite material, the conventional machining of metal grinding wheel has been extremely inferior. Electric machining is the main method of forming surface machining of metal grinding wheel, as the machining difficulties caused by high hardness of materials can be overcome by electric machining. However, there is a big gap between its machining accuracy and practical application requirements. In this paper, the electrical discharge machining(EDM) mechanism of metal grinding wheel is analyzed, and the selection of electrode materials, the selection of electrical parameters and the design of mechanical parameters are systematically studied, the selection basis of reasonable parameters is pointed out. The experimental results show that the arc accuracy and angle accuracy of the forming surface of the metal grinding wheel can reach ±0.003 mm and ±0.1°. Meanwhile, the dressing efficiency of the single grinding wheel is improved by 63.3%. This study is of great significance to improve the dressing precision and efficiency of metal grinding wheel, improve the batch stability of products and reduce the manufacturing cost.