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Wireless sensor networks will play an important role in the next generation pervasive computing. But the character of wireless communication brings a great challenge to the security management measures used in the communication protocols. These measures are different from conventional network security management methods. This paper proposed a security management model for self-organizing wireless sensor networks based on intrusion detection. It can prevent most of attacks. Then an analysis of each layer of networks in our security model is discussed and the security management measures in the data link layer and network layer are described in detail especially.