各种网络攻击事件正频繁发生,如何阻止来自网络外部和网络内部的攻击,显得越来越重要。文中首先分析了现有的网络信息安全系统存在的不足,然后应用智能代理技术,提出一种分布式网络监控系统结构,并进行了形式化分析和实现。由于该网络监控系统克服了现有网络信息安全系统的一些不足,因而具有广泛的应用前景。 Various cyber attacks are taking place frequently. How to stop the attacks from the outside of the network and inside the network becomes more and more important. First of all, this paper analyzes the existing problems of network information security system, and then uses the intelligent agent technology to propose a distributed network monitoring system structure, and formalized analysis and implementation. Due to the network monitoring system overcomes some deficiencies of the existing network information security system, it has a wide range of applications.