With the continuous development of computer networks, global information technology has become a major trend of human development. However, due to the diversity of connection forms, the uneven distribution of terminals, the openness and interconnection of the network, the network is vulnerable to hackers, strange customers, malicious software and other irregularities, so the security and confidentiality of online information is a crucial issue. Whether in LAN or WAN, there are many factors such as natural and human vulnerability and potential threats. Therefore, the security measures of the network should be able to comprehensively address various threats and vulnerabilities, so as to ensure the confidentiality, integrity and availability of network information. Computer encryption technology and firewall technology are becoming more and more important. This paper discusses the reasons and possible forms of computer network information security, and then puts forward some suggestions on how to improve network security protection.<br>Key words: network threat hacker attack encryption technology security protection strategy firewall<br>
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