The residual stress distribution of SUS301 L-MT welded joints by the processes of MIG welding,laser welding and laserMIG hybrid welding were studied X-ray diffraction of two dimensional detector. The results showed that residual stresses under the three welding processes were distributed in "M" pattern,with tensile stress in weld zone and HAZ zone and compressive stress in base zone. The peak stress value was in HAZ zone. The peak longitudinal stress of 631 MPa and peak transverse stress of 400 MPa were found in the MIG welded joints. The residual stresses of laser welded joints and laser-MIG hybrid welded joints were almost the same,with the peak longitudinal stress 490 MPa and peak transverse stress 360 MPa.