Pulsed laser radar detection performance is associated with laser optical pulse emitted by laser light source, and the performance of power supply directly determines the quality of optical pulse. According to the requirements of laser radar system, the high power MOSFET was used as switching device and the driving circuit model was established, designed and analyzed. The driving circuit with 10 ns minimum pulse width, 3.5 ns rising time and 50 kHz pulse repetition frequency was obtained successfully after much experiments. The optical peak power of LD nearly reached 60 W, and it was successfully applied in laser radar as laser emission part. The 3 cm/10.77 m accuracy can satisfy the requirement of a laser radar.