Through the test, the laser-GMAW hybrid welding combining the laser welding and GMAW welding is used, and the thicker steel plates can be welded.Due to the increase of penetration, the energy input also increases correspondingly, and the hardness value is correspondingly lower than that using the laser welding alone. The test results show that, when the test steel plate is welded by the butt joint, and under the condition of changing the groove shapes and interstices, the root is welded by the laser and the upper part of joint is welded by GMAW, and the qualified welds can be produced by this technology, whose macroscopic metallography and hardness meet the requirements.