The method is adopted and developed to keep constant scallop-height in five-axis machining of NURBS surface using flat-end tools to get the CNC tool path. Then, based on the arithmetic of NURBS interpolation, the standard of NURBS during CAM is achieved. As a result, the CC points' quantity is greatly decreased and the problem that the CC path discontinuities of is overcome. Illustrative examples show the substantial improvements achieved over line-interpolation method for decreasing the amount of data on the condition of the same precision.