Our main work is as follows: 1.We analysis of the current study of data mining application in intrusion detection, analysis of its advantages and disadvantages. A common shortcomings existing on association rule mining algorithm is boundary sharpening. 本文研究数据挖掘在入侵检测中应用,对基于关联规则挖掘的入侵检测算法进行研究与改进,主要工作如下:1.研究目前数据挖掘在入侵检测中的应用,分析其优点与存在的不足。