Based on the technology of the ActiveX Automation, this dissertation re-exploits AutoCAD by Visual Basic and the three-dimensional simulation of the ZK worm machining is achieved by Boolean operation, the law of which how tooth profile follows the change of grinding wheel radius is also analyzed.

ZK worm is a kind of new-type worm, which is a conical envelope worm, and it can be grinded by conical wheel directly, with simple grinding technology and high tooth profile accuracy, so its machinability is good.

Based on an example,the mathematical model of multi goals fuzzy reliability optimal design for ZK worm gearing was established.

Mathematical descriptions of worm and worm gear and the means of accurate accomplish based on Pro/E are introduced, parametric design is accomplished by the second development, mechanical simulation is carried out,the working case is dynamic observated.

This paper takes the worm and worm gear as an object,discusses a define of character and parameter and the research of worm and worm gear,which could be used in similar hardware,introduces the theory and method of the redevelopment approachor UG with Visual C++.