Gartner, a well-known market analysis and consulting organization, published an article "Defining the Next Generation Firewall" in 2009. The article pointed out that while the next generation firewall has the functions and characteristics of traditional firewalls, it must also have "integration that supports linkage." IPS", "Application Control and Visualization" and "Intelligent Linkage" related features. Today, when a series of new application technologies such as cloud computing, WEB2.0 and mobile Internet are widely used, Gartner's understanding when defining NGFW in 2009 is obviously insufficient. TOPSEC, the holder of the NGFW trademark and the most well-known information security brand in China, has given the next generation firewall the following six characteristics: based on user protection, oriented to application security, efficient forwarding platform, multi-level redundant architecture, Comprehensive visualization and security technology integration.