Abstract: According to the measurement and machining of shoe last, a new measurement data conversion technology was presented. The concepts of numerical blade and numerical cutting method were introduced. With spatial analytic geometry, the spatial equation of wrap surface of a rotary milling cutter was carried out. According to the principle of profile modeling-manufacturing technique, the numerical cutting technique was used to obtain the original data of the shoe last. And the original discrete model of shoe last was successfully displayed in a CAD software. The error of the method was analyzed for some given cases.