随着Internet/Intranet的高速发展 ,基于Web的应用系统的开发越来越受到人们的重视 “Web+数据库”的两层系统结构是目前Web系统开发中使用的主要方式 ,但实践证明 :以此开发出的应用系统存在着Web服务器负荷过重、执行效率不高以及缺乏延展性等一些缺陷 ,难以应付中大型应用的需求 文中结合现今流行的COM/DCOM、CORBA组件技术 ,从系统构成、负载平衡、核心技术几方面介绍了分布式组件技术在Web系统中的应用 ,着重论述了“中间层”对提高Web系统性能的重要作用 ,并在此基础上实现了一个分布式多层Web应用系统 与两层结构的Web应用系统相比 ,该系统具有较高的灵活性、安全性和执行效率 With the rapid development of Internet / Intranet, the development of Web-based application system is getting more and more attention. The two-tier system structure of “Web + Database” is the main method used in the development of Web system at present. However, The application system has some defects such as heavy load of web server, inefficient execution and lack of extensibility, so it is hard to cope with the demand of large and medium-sized applications. Combined with the popular COM / DCOM and CORBA component technologies, , Several core technology introduces the application of distributed component technology in Web system, and emphatically discusses the important role of “middle layer” to improve the performance of Web system. On this basis, a distributed multi-layer Web application system and Two-tier structure of the Web application system compared to the system with high flexibility, safety and efficiency