Abstract: 2519 high strength aluminum alloy was welded, and the effect of aging treatment and solution treatment on the microstructure and mechanical properties were investigated.Results indicate that the aging treatment is helpful to improve the tensile strength of the joints, when the aging temperature is 150℃, and the tensile strength of the joints reach its max value.The tensile strength of the joints can be improved greatly by solution treatment, and with the increase of the solution temperature, the tensile strength of the joints increases.However, when the temperature reaches 540℃, liquid crack easily occurs, and the tensile strength will be decreased.The solution temperature can be improved to 540℃ by strength solution treatment, and the strength can reach 93%of that of the base metal.