For the aluminum alloy door outer panel with full frame of a certain vehicle model, the optimal springback analysis and compensation scheme were sought by comparing the built-in free springback in software Autoform, Constrained springback with only one support clamping point, and the actual springback results of the parts on site. Then, during the early synchronous engineering phase, the combination of factors affecting springback and the critical processes were identified, and the process sheet for the OP20 drawing process was supplemented. Furthermore, the springback trend in the OP50 flanging process adept by a clamping flanging mechanism was improved, and the reliability of the built-in free springback in the software was verified by Constrained springback with only one support clamping point. Finally, the springback trend under the measuring posture of measuring devices and the assembly posture of vehicle body was checked. The results of the actual debugging phase show that compared with the previous CAE simulation results, through reducing compressive stress, increasing rigidity and A-face compensation, the springback on the pressurized surface is controlled, and the problem of post-order pattern is reduced to ensure that the springback is controlled within an acceptable range. Thus, the accuracy requirements of the door assembly are achieved by the reverse correction of the door inner panel sub assembly.