(Informatization and networking are the general trend of economic and social development in the world today. The in-depth development and utilization of information resources and the informatization and networking of all walks of life have been rapidly opened; information technology is widely used in the whole society, and computer domain networks are widely used. Everyone pays attention. But at the same time, network security technology is widely used in everyone's real life. The main point of this paper is to study the firewall technology in many security technologies, and make a comprehensive study of the firewall technology. The second chapter briefly introduces the research background and foundation of network security, prepares for future chapters, and reviews the basic knowledge of network security technology in detail. The research objectives and levels of network security are introduced. The third chapter focuses on the concept and types of firewall technology, the system structure and key technologies of firewall technology, and finally analyzes the lack of firewall technology. ?In the end of the paper, the primary technology in information security is given.)
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