The radar as a vibration sensing device in this paper for the vibration detection of a limited area, within which the vibration signal is detected using doppler radar sensors, is able to analyze the captured vibration signals (ie, frequency and amplitude), to distinguish the signals of human or train, and then send such distingwished micro-vibration signal to the control center or moving train to slow down or stop the train in order to prevent disasters. The measuring method is described along with results of the practical implementation study. The feasibility of further radar application is also discussed.