Aim\ To workout the interpolation algorithm of B spline curve
which is the most fashionable mathematic method to describe figure in the world. Methods\ The program aims to practical manufacturing by using the method of the least deviation and Clark method. It is worked out by VC++. Results\ Current CNC manufacturing is rest on the discrete points. We can rest on continuous movement tracks of machine tools now. Conclusion\ This algorithm can effectively solve the \!bottle neck\" problem of CAD/CAM.