随着世界的发展,科技一步又一步的提升,使我国进入信息化和网络化的时代同时,也使互联网深入人心,变得触手可及,科技在给人带来便利的同时,另一方面也出现了很多潜在的危害。让互联网变得不再安全,所以网络安全技术的研发一直受到人们的密切关注,特别是技术在局域网环境下的应用,密切影响着局域网的安全。因此,本文主要针对局域网背景下的计算机网络安全现状,分析了应对局域网背景下计算机网络安全的问题存在的威胁以及网络技术在局域网下的应用。 With the development of the world and the step-by-step promotion of science and technology, our country has entered an era of informationization and networking. At the same time, it has also made the Internet popular with people. Science and technology bring convenience to people at the same time. On the other hand, There are also many potential hazards. So that the Internet has become unsafe. Therefore, research and development of network security technology has been closely watched by people. In particular, the application of technology in a local area network environment closely influences the security of a local area network. Therefore, this paper focuses on the status quo of computer network security in the context of local area network, analyzes the threats existing in computer network security in the context of local area network and the application of network technology in local area network.