Abstract: The welding behavior of 5083 aluminum alloy under different welding speed and focus distance was studied, the depth and width of the weld penetration and the microstructure were studied. The results show that the proper dual beam laser welding process is the double beam angle of 20,the welding speed of 2 m/min, the focal length of 0.4 mm. The welding process is stable, and the welding quality is best.