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Aiming at the measurement of landslides, mudslides and other geotechnical hazards, narrow pulse circuity, return signal conditioning circuitry and high-speed sampling module , which can achieve the signal acquisition and complete a TDR monitoring instrument system by using equivalent sampling method and then undertake comparative study of the real-time reflection waveform,were designed by means of the TDR technology which based on spiral parallel transmission line . Spiral parallel transmission line is buried in the mountain. When the deformation occurs in the mountain, the parallel transmission line is correspondingly stretched, and the characteristic impedance of the tensile point is changed. Then using TDR technology to measure and analyze the parallel transmission line, the deformation data of the parallel transmission line which can correspondingly reflect the deformation of the surface of the mountain can be got. The comparative study of the real-time reflection waveform testified that using the TDR technology to monitor spiral parallel transmission line’s deformation is effective and obvious.