在网络环境下开发基于B S结构的计算机辅助教学 (CAI)软件越来越多 ,它具有使用方便和交互性好等优点 ,作者着重研究了VB环境下ActiveX控件的开发过程以及相关的应用 ,同时也讨论了在网络上的使用方法 .-Software of CAI can be designed by B/S method on network. It has many advantages such as easy use and better interacting. The development and applicat ion of ActiveX control in VB are mainly discussed in this paper. ActiveX control used in HTML program on Internet is also studied.