Abstract: For solving the problems of difficulty and low-precision of calibration in traditional method，this paper proposed an eight-points calibration method based on six DOF robot to process the curved surface spares with rotating characteristics. The method utilized the feature of rotating，accurately located the origin point of coordinate frame of spares，and thus improved the precision. With the real example，this paper illustrates that the method can calibrate the coordinate frame of the spare parts with rotating characteristics. This calibration method can improve the matching precision of spare parts coordinate frame and robot coordinate frame.

Key words: six DOF robot, multi-axis cutter sites, curved surface spares with rotating characteristic, eight-points coordinate system calibration