In the traditional C/S mode,the data server would consume a partof the system resources to handle the connection with the client.The running of the system is inefficient.In the three-layered C/S mode ,Business Service is added between User Service and Data Service ,mainly used to connect the data server with the client.The User Service is realized by Active X technology combined with HTML.In the Business Service ,ASP service program running in server access database by using ADO.The Data Service is realized by database administration system.So,the load of the data server is largely reduced, its responding speed is improved, and the running of the whole system is efficient.%传统双层C/S摸式中，服务器要消耗部分系统资源来处理与客户端的连接工作，系统整体运行效率很低。三层C/S模式在用户服务层与数据服务层之间加入一个商业服务层，该层专门负责数据库服务器与客户端的连接工作。用户服务层主要由ActiveX技术结合HTML来实现的。商业服务层中，服务器端执行的ASP服务程序是通过ADO来实现对数据库的访问。数据服务层是由数据库管理系统来实现。这样就大幅度减轻数据库服务器的负担，提高其响应速度，系统整体运行效率明显提高。
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