中文摘要：

本文基于．NET技术设计了三层B／S结构的网络考试系统。考试系统中的每个服务如身份验证服务、成卷服务、阅卷服务、信息发布服务等都是以一个Web服务。即Web Service存在。它们可以被布署在不同的计算机上面，通过IIS服务器，当Internet上的一个Web客户访问这些服务时，系统靠．NET的运行机制可以找到这些服务并加以访问。

英文摘要：

We design a network exam system of three layers B/S structure based on .NET. Each of services in exam system such as ID validate, test paper creating service, reading service, information issuance service, exists as a web service, that＇ s to say that Web Service exists. They can be stated in different computers by IIS server. When an Internet web customer visits these services, the system can find these services and visit them by .NET run mechanism.