说明：  因特网的迅猛发展给企业运作带来了极大的方便，但同时因特网也面临着空前的威胁。因此，如何使用有效可行的方法使企业网络威胁降到最小，引起了越来越多企业的关注。而防火墙在企业网络安全中扮演了一个举足轻重的角色，成为企业网络安全的保护者之一。 这里所研究的内容就是中小型企业防火墙设计。我们通过软件防火墙和硬件防火墙两个方面来研究该课题。并针对企业网络所受威胁，进行企业防火墙的方案设计。 关键词：网络安全，中小型企业，防火墙
(The rapid development of the Internet brought great convenience to business Operations, but at the same time, the Internet is also faced with an unprecedented threat. Therefore, how to use effective and feasible method to minimize the threat to corporate networks is causing more and more company’s attention. The firewall in the enterprise network security plays a pivotal role as the protector of enterprise network security. The content of this study is the design of small and medium enterprise firewall. We study enterprise firewall through software firewall and hardware firewall. Also we design and conduct of the corporate firewall according to the threats against corporate networks. Keywords：Network Security, small and medium enterprise ,firewall )