随着计算机技术的发展,工业化的生产力已经离不开信息化。为了有效地利用信息资源,适应信息急剧膨胀的变化,建立计算机网络是跨入网络经济时代的基本条件,构建先进的研制管理体制的技术基础。在计算机网络的设计过程中,人们总是希望能够实现资源共享。但是在实际应用中,资源共享如果超越了一定范围,就会造成信息破坏、信息泄密等的网络安全危害,本文分析网络系统的主要威胁,提出了网络安全设计的主要解决方法。 With the development of computer technology, the productivity of industrialization can not be separated from informationization. In order to make effective use of information resources and to adapt to the rapid change of information, the establishment of computer network is the basic condition for entering the era of network economy and the technical foundation for the development of advanced management system. In the computer network design process, people always hope to achieve resource sharing. However, in practice, if resource sharing goes beyond a certain range, network security hazards such as information destruction and information leakage will be caused. This article analyzes the main threats to network systems and presents the main solutions to network security design.