This system is a child system of aviation reducer CAD system. It reasearches on the conical gear which is the key spare part in the aviation reducerr. Based on AutoCAD desk and compiling procedure with ADSRX and C++ language, it realizes the integration of routine design, verifying caculation, optimization design and parametric drawing. Practice proves that the routine design of this system is right and result of optimization design is perfect, has high engineering applying value.