The effect of processing pre-punched hole on the forming state of sheets is analyzed. Numerical simulation is applied to the study on processing pre-punched hole setting. With two simulated instances. it can be known that the processing holes on different feature surfaces have different effects on the forming of parts . Processing pre-punched holes can't always improve the forming state of parts. Some rules of processing pre-punched hole setting are summarized through the simulated results of two instances ...