Abstract: When pulse laser ranging for a non-cooperative target in space, due to the large distance span of the target, the corresponding echo signal dynamic range is also great. Single method of optical or electronic adjustment can't meet the requirements of whole range receiving. According to the different distance range, in the transmitter the output beam of pulsed fiber laser and pulsed solid state laser was coaxial by polarization beam combiner and the laser emission power was classified. In the receiver the magnification of avalanche photodiode was also classified. Introducing a narrow-pulse peak detector and a variable gain amplifier, the output of the receiving circuit was stabilized by closed-loop automatic control. The equivalent input dynamic range of 160 dB and measuring range of 15 m-20 km was realized in a pulse laser ranging system.