Because intrusion detection in Ad-hoc network is done by a distributed and cooperative manner, the detection technique based on the reputation generated by each node is vulnerable to a false accusation. If the management of the false accusation is not considered in the intrusion detection process, a normal node may be falsely accused. and it can cause severe performance degradation. Therefore, in this paper, we propose an enhanced reputation-based intrusion detection technique that can manage the false accusation efficiently and conduct simulation experiments for evaluation.