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Pulsed Laser Range Finder obtain the distance between target and measuring system by measuring the round-trip flight time of laser pulses, and the measurement accuracy of flight time is the key factor for measuring precision. The laser echo signal processing circuit was studied in this paper, use the TDC_GP21(time-digital-converter chip) design a time interval measurement module, meanwhile the measurement principle and the working process of TDC_GP21 were described in detail, the Range Finder uses TMS320F2812 as the main control chip for the sake of improving the speed of processing data. The experimental results show that the range finder has simple construction, convenient operation, measuring range is 75 m-5 km, measuring precision is ±1 m,low cost and is able to meet the demand for space target range in the aerospace field.