Abstract: As-quenched 2A12 aluminum alloy specimens with nine kinds of size obtained after aging at room temperature for 10, 20, 30 min, respectively, were bulged under three types of lubrication conditions including solid lubrication, liquid lubrication and no lubrication, respectively. The forming limit diagram of the aluminum alloy was obtained, and the effect of aging time on the formability was analyzed. The results show that the as-quenched 2A12 aluminum alloy obtained after aging for 10 min had good formability. With the increase of aging time, the forming limit curves moved down, indicating that the plasticity of the aluminum alloy decreased and the forming safety area became smaller. The appropriate natural aging time of 2A12 aluminum alloy before forming was within 10 min.