This paper studies the traditional computer security model and the common intrusion detection model first , then analyzes and summarizes the main intrusion detection methods and their features . the signature - based intrusion detection is analyzed with emphasis , and the goal of the paper is to discuss how to improve efficiency and accuracy of the signature - based intrusion detection 本文从研究传统计算机安全模型和通用入侵检测模型入手,分析总结了当前主要的入侵检测技术以及技术上的优缺点,并重点分析了基于特征检测的有关技术。