Abstract: Wrought magnesium alloy AZ31B was welded with laser TIG(tungsten inert gas) hybrid overlip welding process and the surface appearance of the bead,the influencing factors of the penetration and shear strength were discussed.The results show that the bead evidently presents "pin shape" when welded by laser TIG hybrid overlip welding.The top of bead is the typical shape when welded with TIG process,while the bottom of bead showed the typical shape of laser welding.It was a good way to weld magnesium alloy by using the laser TIG hybrid welding with advantages high welding speed,aesthetic bead form,comparative wide welding parameters and high shear strength of joints.