Abstract: A diode driving system is represented, which mainly contain high-stable temperature control circuit, high-stable current control circuit and protection circuit. Concrete circuit is given. The laser can work stably by simultaneously control the current and temperature precisely. Experiment results show that the output wavelength of the LD under constant temperature（room temperature） drifts no more than 0.6pm. When the environmental temperature changes from 10℃ to 50℃, the drift is no more than 16pm. Which, accordingly, can be applied to circumstances that request for high stability of LD.

Key words: Optoelectronics; Tunable diode laser; Driving control; Low temperature drift