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Design the Sybil intrusion defense system of Internet of things, intrusion detection, to protect the security of Internet of things network. Aiming at the problem of current intrusion defense system, suchas:the accuracy is not good, proposed a network intrusion signal detection and feedforward modulation filter design of IOT Sybil intrusion defense system design method. First Sybil intrusion defense system overall design description and function analysis, and then the Sybil intrusion signal detection algorithm is designed, the oriented networking Sybil intrusion defense system hardware design and software development, system integration design. Simulation tests show that the system is used in the Internet of things Sybil intrusion detection accuracy is higher, better performance, with strong compatibility and friendly.