Abstract: The EDM in-situ dressing technology is used to carry out the precision dressing experiment on the arc-shaped metal base superabrasive wheel. The results show that: compared with the traditional Compared with the "opposite grinding method", the precision and efficiency of the dressing are greatly improved: when the discharge gap is 55 μ m, the discharge current is 15 A, the duty cycle is 20%, and the rotation speed of the grinding wheel is 1 200 r/min, the high precision grinding wheel with the contour deviation PV value of 4.58 μ m is obtained. The efficiency and accuracy of the modification were increased by 37% and 12.09%.