Abstract: As one of the effective supplements of firewall technology intrusion detection system  is widely used in practice,but the traditional intrusion detection system has some limitations.Intrusion detection system based on mobile agent has become an important direction in the research field of  distributed intrusion detection technology.This paper analyzes the deficiency of existing intrusion detection system,introduces the  mobile agent technology,and thus designs a mobile-Agent-based distributed intrusion detection system model structure,which can improve  the suspicious behavior analysis and response and effectively deal with distributed intrusion behavior.

Key words: mobile agent, Agent, intrusion detection, system design