A novel tracking laser surface velocimeter(TLSV) is proposed to improve both the measurement accuracy and the temporal resolution in monitoring landslide surface displacements.The TLSV based on the laser Doppler Effect utilizes the feedback control technology,which can implement the precise measurement of velocity and displacement along the optical axis of objects,and track objects automatically.In order to further increase the signal-to-noise ratio of the Doppler signal,the signal shift denoising method is...