Abstract: Laser-twin-wire pulsed MIG hybrid welding is a new welding technology which combines laser welding and twinwire MIG welding. As one of the most important factors in this technology, laser power has significant effect on the welding procedure and properties of joint. A laser-twin-wire pulsed MIG hybrid welding system was established to investigate the effect of laser power on arc behavior and metal transfer in this process.High-speed photography system with synchronous electrical signal, including current and voltage signals, were adopted to record the arc behavior and metal transfer during welding. The results showed that the arc shape and stress status of the droplet were affected by the interaction between laser-induced plasma and arc plasma. With the increase of laser power, the laser-arc attraction was enhanced, the component force of plasma stream force in the vertical downward which could promote droplet transfer reduced. As a result, the droplet transfer frequency decreased.