A simple LD laser drive circuit was designed for pulse phase laser rangefinder,which contains the frequency synthesizer and the laser modulation circuit.This paper analyzes the effect of the circuit on the ranging range,accuracy,cycle and energy consumption,and illustrates the key points to improve laser ranging performance.Intermittent burst emission was achieved by enabling and disabling the operational transcondnctance amplifiers（OTA）.This intermittent burst emission heightens the laser peak power,which can enhance the measurement range.This circuit design is simple and feasible,and has cerctain reference value for the handheld laser rangefinder developing.