This article introduces the structure of CAD software on steam jetting vacuum pump. Emphasis is given to its optimum design, parameter graph and automatic assembly.

• 介绍了水蒸汽喷射式真空泵CAD软件的体系结构，着重论述了喷射式真空泵参数优化、参数化绘图及两维零件图自动装配的实现方法。