Laser filled wire welding and MAG welding of SUS301 L sheets with the lap joint form 1 mm +2 mm were carried out,and comparative researched the effect of the two welding method on welding appearance,microstructure and properties. The result showed that the laser filled wire welding had a better weld formation than MAG welding,the reinforcement and weld width of weld significantly reduced. Microstructure of laser filled wire welding joint consisted of fine columnar austenitic dendritic crystals,microstructure of MAG welding joint consisted of coarse columnar austenite and isometric crystal. Laser filled wire welding had a higher weld hardness than MAG welding,and the tensile shear force was 727.3 MPa,up to 73% of base metal. Both of them break at the weld,in a classical ductile way.