Compared with traditional welding technology, laser powder-filled welding technology has incomparable advantages to realize flexible welding with large allowance and high quality. Based on the process test of GH3030 superalloy, the effects of laser power, scanning speed and defocusing amount on the weld surface morphology and tensile strength were studied. Under the conditions of laser power 2 100 W, scanning speed 900 mm/min and defocusing amount + 2 mm, the welding seam with certain melting width, even continuity and no defects can be obtained, and the tensile strength after welding is better than that of base metal under the better process parameters. The selection of process parameters has a great influence on the tensile strength of welded joints. On the premise of good metallurgical bonding, the key to improve the tensile strength is to avoid coarse grain and loose structure.