After the aging treatment of 6061-T6 aluminum alloy plate at different temperatures, steel/aluminum self-pierce riveting experiments were conducted, and the influence laws of different aging treatments on the mechanical properties and organization of self-pierce riveting joints were studied by tensile experiments, metallographic, scanning electron microscopy etc. The results show that the aging temperature has an impact on the steel/aluminum self-pierce riveting forming, and the internal locking values of self-pierce riveting specimens at the aging temperatures of 150, 190 and 230 ℃ are 1.13, 0.94 and 0.88 mm, respectively. The aging temperature has little effect on the material flow in the internal locking area of self-pierce riveting joints, and the aluminum alloy exhibits the streamlined and layered distribution. With the increasing of aging temperature, the number of strengthening phases precipitated in the metallographic organization of aluminum alloy part in the self-pierce riveting joints increases, the grain size becomes larger, and the strength of alloy increases. The maximum tensile static loads of self-pierce riveting joints at the aging temperatures of 150,190 and 230 ℃ are 3.46, 3.28 and 3.12 kN, respectively. However, the tensile failure modes of joints are not significantly different, and all of which are tearing failure of the upper connecting plate, and there are scratch marks at the tearing points, and there are toughness dimples of different sizes and depths distributed.