Abstract: Zn-2%Al, Zn-15%Al and Zn-22%Al flux-cored wires were used to study the laser welding brazing process of aluminum alloy and copper, and the effects of Al content in the wire on the microstructure and properties of the laser welding brazing joints of aluminum and copper were discussed.The results show that the welding joints of the three welding wires can be divided into aluminum side welding seam area, welding seam center area and copper side brazing area.The brazing area at the copper side can be subdivided into Al-Cu eutectic area and the metal compound layer with the main phase of Al_4.2Cu_3.2Zn_0.7.The dendritic phase in the weld is CuZn₅, and the matrix structure is zinc-aluminum eutectic.The welded joint obtained by using Zn-22%Al flux-cored welding wire fractures at the aluminum base metal, and the tensile strength of the joint is the maximum of 212 MPa.With the decrease of Al content in the welding wire, the tensile strength of the joint gradually decreases.