Abstract：Simplex firewall strategy can′t satisfy the requests with the increasing of network attack toolsand means.In order to solve problems existing in the traditional intrusion detection systems, the paper puts forward an intelligence network intrusion detection system model based on data mining.The application of data mining technology of network intrusion detection can collect audit data to calculate the model.The system can capture the real intrusion and the normal action mode and intrusion detection is intelligent through the building of intrusion detection rules automatically.The basic theory of the model is introduced.Its structure and main function are analyzed.The model is an open system having good scalability and adaptability and can reduce the cost of deploying an intrusion detection system.The problem of environment adaptability is solved and the efficiency of system is proved.

Keyword：Intrusion Detection System;Data mining;Information Security;