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The failure node in the multi scale sensor networks is accurately detected and located, which can realize the efficient detection of the fault nodes and ensure the reliable operation of the sensor network. A failure detection algorithm based on multi sensor fusion tracking filter detection algorithm is proposed, and the optimal design of the detection system is presented. The node distribution entity object model of multi scale sensing network is constructed, and the overall design and technical index analysis of the failure node detection system are carried out. Design of failure node detection algorithm based on multi sensor fusion tracking filter detection. The hardware design of the system, including the A/D module design, clock circuit design, program load circuit design, sensor communication module design and system power module is designed. Development of test system software is taken in ARM Cortex?-M0 platform. The system simulation results show that the system has a high accuracy in detecting the failure node of the multi scale sensor network, which improves the lifetime of the sensor network.