文中阐述了网络安全的根本变化和我国发展民族信息安全体系的重要性及建立有中国特色的网络安全体系的必要性。简述了防火墙的分类,论述了部署原则,并从防火墙部署的位置详细阐述了防火墙的选择标准及现状。 The article expounds the fundamental changes of cyber security and the importance of developing national information security system and the necessity of establishing cyber security system with Chinese characteristics. The classification of firewalls is briefly introduced. The principle of deployment is discussed. The selection criterion and current status of firewalls are elaborated from the location of firewall deployment.