Laser-weaving welding process of SUS316 stainless steel was studied in this paper. The test was carried out by changing scanning amplitude, frequency, welding speed, laser power, defocusing amount, etc. The welding forming and mechanical property were tested and compared at different scanning mode. Results show that rectangular weld with good appearance can be achieved when the vertical amplitude is ≥ 0.15 mm. Lower frequency results in dentate weld, and higher frequency will lead to undercut more easily. Good appearance can be achieved with suitable frequency from 300 Hz to 400 Hz. To avoid dentate weld, the ratio of frequency to weld speed should be more than 10. Laser power and defocusing amount mainly affect weld depth and width. Compared with normal laser welding, the weld of laser-weaving welding is stronger. When the weld width is about 1 mm，stainless steel with 1 mm thickness can be processed as overlap joint with tensile strength 698 MPa, which is 1.34 times higher than base metal.