Due to the defects such as fish-scale and serrated edges on the weld surface of laser wire -filled brazing on the top cover,a grinding system based on adaptive contact flange,electric spindle and robot was proposed.The adaptive contact flange fixed at the end of the robot compacted the welding seam with constant pressure,and the grinding piece was driven by the motorized spindle for high-speed rotation.The high-speed rotating grinding piece acts on the welding seam for grinding.The hardware composition,communication structure and grinding process of the system were introduced,and the influence rules of contact flange pressure,rotating direction and speed of motorized spindle and grinding posture on grinding quality were also analyzed.