With the development of STEP standard, more and more CAD systems support STEP standard, so a STEP based tool for integration of CAD/CAPP is necessary.

• STEP标准的发展和应用 ；使其成为 CA D/ CAPP/ CAM系统信息集成的基础 .；随着越来越多的 CAD系统支持 STEP标准；开发基于 STEP的 CAD/ CAPP集成工具成为当务之急