介绍一种用阻执法检测呼吸信号的硬件电路。该电路采用四电极法检测呼吸波，克服了二电极法检测所带来的信号不稳定、易受干扰等问题。在信号处理上，使用多重滤波与放大，克服了心动、血流等信号的干扰。该电路已成功地应用于我们研制的模块化生命参数监护议中，取得了较满意的效果。 Introduce a hardware circuit that uses resistance to detect respiratory signals. The circuit uses a four-electrode method to detect respiratory waves, which overcomes the problems of unstable signals and interference caused by the two-electrode method. In signal processing, multiple filters and amplification are used to overcome the interference of signals such as heartbeat and blood flow. The circuit has been successfully applied to the modular life parameters monitoring protocol developed by us and has achieved satisfactory results.