With the development of computer technology and network technology, network security has become one of the hot problem of the information society security, and it also has a higher technical requirement for the network security problem. Starting from the definition of computer network security, this paper analyzes the common problems in current network security, provides defensive countermeasures to protect the network security feasibility, and explores a new idea for the computer network security.%随着计算机技术和网络技术的不断发展，网络的安全问题成了信息社会安全问题的热点之一，对网络安全问题也提出了更高的技术要求。本文从计算机网络安全定义出发，分析目前网络安全存在的普遍问题，并提供了防御对策，保障网络安全可行性，为计算机网络安全工作探索一条新思路。
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