Abstract
In this paper, the design of a set of plastic injection mold was completed for plastic gear part. During design process the author used mainly Pro/E and AutoCAD software tools, taking advantages of computer-aided design to achieve the vision of mold design. The author analyzed the structure of the plastic part, chose the kind of projection of a single-mold surface, and used Pro / E module to complete the modeling of molding parts. And us the Pro / EMX module was used to complete the ejection system, oriented system and structures parts . Finally, die deputy general assembly was drown by using the AutoCAD. In short, the mold design was simple, and the mold drawings are instructive for actual production.