本文分析了校园网络安全对防火墙的需求，考虑到校园网防火墙价格问题以及部分功能受限制的影响，构建较高性价比的防火墙系统，对校园网防火墙进行了配置与实现。实践证明，该系统能有效保护校园网络的安全。

This paper analyzes the demand of campus network security for firewall, considering the price and the limited function of campus network firewall, constructs a firewall system with high performance-price ratio. Practice shows that the system can effectively protect the security of campus network.