In order to emerge the surface fracture of auto body panel, four kinds of experimental dies containing class A surface feature of auto body outer panel was designed. The fracture phenomenon was observed during the stamping experiment. At the same time, numerical simulation based on an independently developed commercial CAE software KMAS/UFT of sheet metal forming was carried out. Comparison between experimental and simulated results based on LS-DYNA3D was made which showed good consistence. And then a universal formability theory called UFT was introduced to optimize the adjustment amount of metal flow and the stamping dies for fracture. Some suggestions were given by investigating the adjustment amount and modification of the stamping die.