Abstract: New Loop Worm Transmission is distinguished for its high transmission as well as high carrying capacity,but its part structure and machining technology are complicated that restricts its wide application to certain extent.Through applying computer graphics tools,the authors worked out the techniques of parametric design and solid modeling of new loop worm and gear.Thus,it lags a foundation for the following numerical control maching and it explores out some means and skills to use computer virtual reality technology conducting the entity modeling of complex parts.