Abstract: Aiming at the pulse width intensity features of echo signal of long-distance laser range finder and the statistical characteristics of noise, a echo signal detection technology of high-precision multi-pulse laser range finder was proposed.The 400 MHz high-speed signal acquisition and digital processing was achieved by using the clock phase shift distribution way, so as to improve the echo pulse detection accuracy.An ARM embedded high-speed core processor was used for data processing, the functions of filtering noise reduction, adaptive threshold detection, multi-frame correlation detection and others were completed, which can make the signal-to-noise ration (SNR) increased by 7.6 dB and make the goal for acquiring long-distance target information accurately achieved.