After the interaction of laser MIG and arc,grain sizes in top welding seam center are different from that in bottom welding seam center.Based on this,the effects of welding speed on the microstructure,tensile property and microhardness of 6009 aluminum alloy are studied.The results show that the tensile strength and elongation of the hybrid joint increase with the increase of welding speed;the fracture position of hybrid welding transfers from welding seam to heat affected zone(HAZ),and dimple morphologies appear in the fractures,and the mechanism of fracture is microporous gathered fracture;grains in the upper welding center are smaller than that in the lower welding center,and its size distribute is uniform.Moreover,the microhardness of top welding seam is greater than that of bottom,and there is welding softened zone in HAZ,and its width is 4 to 6 mm.