The creep unified constitutive equations based on aluminum alloy aging forming mechanism were further developed by the large scale commercial finite element software MSC.Marc, and 7055 aluminum alloy stiffened panel creep age forming process simulations were completely conducted. Then springback of the stiffened plate after forming was calculated by ATOS Professional software, and its correctness was verified by experimental studies. The results show that, the springback of the stiffened plate under the simple static load is 16.14%, while it reduces to 10.34% after creep age forming, which shows that ribs play some certain role on the springback of the skin in the process of creep age forming. And the geometry shape of the stiffened plate after creep age forming is jointly determined by the plastic deformation of the ribs and the creep strain of the workpiece.

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