近年来,网络安全事故频繁发生,人们也对网络安全提起了高度重视,并且也做了很多有价值的研究。随着网络的快速发展,新的病毒和木马不断涌现,加大了网络安全的隐患,作为保障网络安全的一个重要手段——计算机信息技术,需要不断了升级。本文主要对计算机信息技术的发展现状、计算机网络信息安全存在的威胁、计算机信息技术防范网络安全、防范网络安全的其它措施进行了分析。 In recent years, network security accidents occur frequently, people also attach great importance to network security, and also done a lot of valuable research. With the rapid development of the Internet, new viruses and Trojans continue to emerge, increasing the hidden dangers of network security. As an important means of ensuring network security, computer information technology needs to be continuously upgraded. This article mainly analyzes the present situation of the development of computer information technology, the threat of computer network information security, the countermeasure of computer information technology preventing network security and preventing network security.