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In wireless sensor networks (WSNs), the reliability of the signal acquisition transfer affects the accuracy of the system result, and for applied in different areas of the WSNs, the node can be damaged, the situation of the information transfer process is under attack, in order to guarantee the accuracy of the results, timely and accurate judgment nodes working condition is very important. Based on sensor node analysis, the paper introduces the suspicious nodes judging ways, at the same time combining the application of the WSNs on maternal and infant security system, By the law of the signal strength and signal presented to detect suspicious nodes solution in maternal and infant security system of practical, and analyzes the maternal and infant security system how to use the suspicious nodes to achieve the result of monitoring.