This paper analyzes the problem of network security and gives a new design of firewall.It colligates the technology of class filter and getway, and builds a new architecture of firewall.

• 摘要文章结合现有的防火墙技术，给出了一种混合型的防火墙的设计方法，将分组过滤技术与应用网关技术结合起来，形成一种更加安全的防火墙结构。