Abstract: This article introduced a pulsed laser-arc hybrid welding phase matching control system based on Labview.Using NI's PCI6221 data acquisition card, the DAQ system acquired current of AC arc signal, processed the signal and capture the feature points of arc by the computer, thus accurately analyzed the phase of AC arc, and realized a continuous trigger control of pulsed laser on specific phase of AC arc. The locking trigger method was put forward, which eliminated the wrong trigger of laser, realized frequency doubling of pulsed laser and arc and trigger frequency protection of laser. The verifying experiment indicated that the system realized a accurately trigger control of specific phase of arc and the pulsed laser, and also provided the technical support of flexible combination of energy of pulsed laser and AC arc and the research on mechanism of interaction between the two heat resource.