Abstract: In order to quickly determine the full-process forming process plan for large automobile panels, shorten the number of full-process forming simulation iterations and calculation cycles, and improve the full-process forming simulation accuracy, the side outer panel of a certain car model was taken as the research target. According to the product structure characteristics, the side outer panel was divided into several regions, combined with the process characteristics of each region the key section parameters of the die surface was drew, the die surface was designed efficiently by using the key section parameters, and the feasibility of the full process plan was verified by using the finite element analysis software. The results shown that the side outer panel were fully formed as a whole, without cracks, wrinkles, and obvious surface defects and other forming problems. On this basis, the die tryout was verified, and the samples with good forming effect and basically consistent with the numerical simulation results were obtained. Research has shown that after applying the die surface engineering technology based on the key section parameters-driven die surface design, the side outer panel does not need to carry out die surface design, repeated adjustment and optimization in the finite element analysis software, which significantly improves the simulation accuracy and efficiency of the full process of the side outer panel.