On the basis of analyzing the main factors effecting on the LD stability,a 1 kHz repeating frequency LD driving power supply with real-time feedback,closed-loop control and pulse current stabilization was designed.By restraining the surge and the ripple,adopting the delay-time and soft-startup circuit,this system improves the security of both the LD component and power supply.With the thermo-electronic cooler and PC that can detect the circuit real-time,the temperature of the LD can be kept accurately.Primarily,the LD laser output power is 150 W,the stability of the constant temperature power is 0.2 ℃,and the laser line width is about 6 GHz in the experiment.