Abstract: In order to improve the stability and adjustability of the output of the driving system of high power laser diodes, improve the beam quality and increase the service life, based on the principle of differential amplifier circuit and open-circuit time constant, the static working point and the frequency response characteristics of the driving circuit were analyzed in theory and verified in experiments. The results show that the drive circuit can guarantee the output current to achieve the peak current of 0A~60A under the premise of no overshoot, the pulse width adjustable range from 20μs to continuous, the repetition frequency from 500Hz to 10kHz, the maximum power of 130W. This method improves the output stability, widens the adjustability of pulse width and repetition frequency and has more outstanding performance than the traditional methods.