Laser diode (LD) driver circuit,which is based on the metal-oxide-semiconductor field-effect transistor (MOSFET) and discharging capacitor, its performance mainly depend on the MOSFET. If the distributed parameter is not perfectly controlled, pulse current output is so distorted that it can not drive the LD.overshoot, even the ringing may occur. We design complementary output circuit to solve this problem, it provides faster pulse-off time, and restrains the overshoot and ringing. Experimental results show that the new circuit improves the output effectively.