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Intrusion detection is an efficient method against attacks in computer network and system. Most intrusion detection system for sensor networks and ad hoc networks are based on the cooperative of intrusion detection agents and suffered from a computation and memory usage overload. In this paper, we address this problem by proposing a lightweight algorithm to select and activate the intrusion detection modules on particular sensor nodes. We also apply over-hearing mechanism to reduce the redundant sending alert packets thus enhance network lifetimes.