This design is a redevelopment of Mastercam. The cutting dosages are varies with the basic conditions, which contains parts material, tool materials, machine tool rigidity coefficient and so on .The problem is that we must modify cutting dosages one after another when the basic conditions changed. In view of the above problems, we using VB software design a specialized software. We can realize the automatic generation of cutting parameter of Mastercam by debugging this specialized software and Mastercam software. This software is convenient and practical, using it, We can save the processing time and increase work efficiency.