Towards the security defects of current popular CAD systems, this paper brings forward the concept of the Security CAD System ( SCADS ) and gives an appropriate implementation of the system.

• 针对目前商业化CAD系统的安全缺陷以及在企业实施中存在的安全问题,提出防扩散CAD系统的概念,并给出一套实现方案。