Abstract: Semiconductor lasers and their industrial applications are research focus in laser field, the development of domestic high power semiconductor lasers has made great progress, but the research on automated processing equipment based on domestic high power semiconductor direct output lasers is few. A laser processing equipment was developed which was based on domestic high power direct output semiconductor lasers. DSP-based embedded control system was also developed for laser processing measurement and control, and fuzzy control algorithm was designed for closed-loop temperature control, and a desirable temperature control effect was acheved. Wideband laser transformation hardening experiments on this platform show that, the consistency of depth and hardness of the transformation hardening layer are better in the temperature control mode contrast to that in the constant power mode.