This letter reports the low noise control and wavelength shift of a commercial fixed-wavelength high-power DFB laser emitting at 785 nm. In this control system, a novel current driving module integrated with PID temperature controller is designed to provide precise injection current and stable operating temperature. The start- up and stop characteristic of this system is improved as well, to optimize output response and extend service life of the DFB laser. Experimental results show that the optical output power can be accurately controlled in the range of 0 to 600 mW, with the stability better than 2 ‰. In addition, we could effectively control the center wavelength from 785 nm to 793 nm maintaining the linewidth less than 0.9 nm. The research will enhance the performance and extend the use of present commercial DFB laser.