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In the single frequency continuous wave radar life detection system,based on the Doppler effect,the theory model of radar life signal is expressed by the real function,and there is a phenomenon that cant be confirmed by the experiment.When the phase generated by the distance between the measured object and the radar measuring head isлof integer times,the main frequency spectrum of life signal(respiration and heartbeat)is not existed in radar life signal.If this phase is л/2 of odd times,the main frequency spectrum of breath and heartbeat frequency is the strongest.