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Internet technology has developed rapidly and both software system and hardware equipment have improved greatly in recent years. However, Internet brings people not only convenience but also great potential threats. Facts show that potential safety hazards exist from the emergence of internet. As a kind of effective information security safeguard measure, intrusion detection makes up for the defects of traditional security protection techniques. As a kind of effective data analysis method, data mining is introduced into intrusion detection systems. This paper puts forward the idea of applying data mining technology to intrusion detection systems and then designs data preprocessing module, association analysis module and cluster module respectively.