According to the demand of fiber laser pumping source for communication, and combining the characteristics of Laser Diode, a driving circuit with high performance and low cost is designed, which is composed of constant current circuit, control circuit and protection circuit. The constant current circuit uses a Darlington transistor as an adjuster, and the deep negative feedback state of integrated operational amplifier to realize constant current output. The experiment results prove that the system has the current stability of 0.03% with small ripple,and can realize the driving of LD for pumping fiber laser.