In order to solve the problem of contour programming inefficiency and poor quality in the nonhighspeed machine curved surface processing, a continuous feed programming method based on polar coordinates in curved surface processing was proposed, while program was whiten using macro program. Taking inner loop surface as example, a loop was used to white macro program which was verified. Using this method, the processing efficiency of curved surface parts is effectively improved, knife marks in stopping place are avoided. It provides method and strategy for macro programs of processing curved surface in nonhighspeed CNC machining.