本文针对企业目前面临的网络安全困境，提出一个网络安全模型，企业可以依据该模型为自己的网络制定安全策略，从而提高企业网络的安全性。文章还为企业的网络安全设计提出建议，最后给出了一个企业网络安全性设计的例子。关键词：网络系统网络安全 加密 防火墙Abstract: A pattern of network security is given aiming at the network security problem puzzling a corporation. Depending on this pattern, the corporation can make out its strategies of the network security, thus strengthen the safety of the network. At last, in this paper, somesuggestions and an example are given to the design of the network security of the corporation.Key words: network system, network security , encrypt , firewall