Due to the complexity and uncertainty of influencing factors and controls on the automobile body forming quality, it is hard to determine reasonable combination of stamping process parameters only by experience and trialanderror method. The lower back panel of an automobile was taken as an example to optimize stamping process parameters by using an optimization design method based on stochastic focusing search algorithm. The training samples for the optimization model were obtained by combining numerical simulation with orthogonal experiments, and the BP neural network was used to construct the optimized objective function model for the stochastic focusing search algorithm. Based on the function model, the multiobjective optimization of process parameters was conducted by using the stochastic focusing search algorithm, which were verified and validated by numerical simulation and site die trial respectively. The result shows that the better and consistent forming quality is obtained by using the optimized process parameters, which verifies the validty of the optimization method.