Internet技术为工程设计提供了便于共同研究和实时交流的环境支撑 ,而 CORBA技术屏蔽了网络、操作系统及编程语言的异构性 ,IIOP则实现了这两种技术的结合 .本文在此基础上提出了一种实现计算机辅助设计 (CAD)互操作的系统结构 Net CAD,给出了基于 CORBA/IIOP面向 Web的 Net CAD系统实现方法与系统实现 ,并结合一个具体的实例描述了 Net CAD系统实现过程与使用方式 ,此系统实现了用户、工程设计者异地远程查询并修改 CAD设计资源 ,实现了异地实时设计与交流 . ; 国家863/CIMS主题资助项目!(86 3-5 11-0 30 -0 0 7-1) ; The popularity of Internet technologies provide the possibility of remote cooperation and real time design. In addition, CORBA technology is adopted to avoid heterogeneity of networks, operating systems or programming languages. IIOP(Internet Inter ORB Protocol) combines both of the technologies above. Based on CORBA/IIOP for Web, this paper advances a NetCAD system and its system structure, and demonstrates the system implementing process by a simple example, which can realize the remote queries between user and project designers and modify the remote CAD design resources simultaneously.