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The problem of security in communication has been researched to ad hoc network in this paper, and it also has been proposed a distributed intrusion detection model which is based on the fuzzy judgment. The judging rules of the aggressive behavior are summarized in this model according to the different offensive features in routing layer. Moreover, the log is established according to IP packets in routing layer, and the fuzzy evaluation to the data is carried on. On the base of this, a way to enhance the correct rate of the detection by joint detection mechanism of multi-point cooperation has been introduced in this paper. To distribute the network resource dynamically and reasonably, all nodes are treated dynamically with safety classification. Taking AODV routing protocol as an example, the working mechanism of the model is introduced, and the software NS2 is used to put up network simulation platform. The experimental results show that the detection model can guarantee the network security better.