Abstract: Human micro-motion study based on radar is a new technique developed in recent years.Through signal disposal measures，Doppler shift of human arms and legs during walking can be gained so as that human pace may be detected and recognized.The paper first analyzed the modulating of human walking on radar wave， introduced the X-band continuous wave radar system used on human motion feature measurement and relative  measurement experiment，and analyzed the micro-doppler feature of human walking through the field-measured data. The paper deeply studied the methods of feature parameter extraction and human pace parameter estimation raised by P.van Dorp，and used it in the measurement result of this radar system.Finally the paper gave the simulation result.