This paper introduces the importance of VPDT (virtual product development technique)and some concepts (simulation and VR-virtual reality,CAX integration and VPD system,STEP and VP database as well as the level of VPDT applications) are discussed.

• 介绍了关于虚拟产品开发（VPD）技术的模拟和虚拟现实、虚拟产品数据和STEP标准、并行工程的CAX集成系统和虚拟产品开发系统及技术、VPD技术应用层次等概念。