在分析计算机网络及大学校园网安全因素的基础上,介绍了防火墙的特性、功能、实现方式、分类等,重点讨论了大学校园网安全的相关内容,以及校园网络环境下如何利用防火墙技术保障校园网络的安全。 On the basis of analyzing the security factors of computer network and university campus network, this paper introduces the characteristics, functions, implementation methods and classification of firewalls. It focuses on the contents of university campus network security and how to use firewall technology to protect the campus Network security.