20d缩短为6d。 The designed and made periods of traditional auto panel die mould is longer, and craftwork design efficiency is lower. Aiming at this circumstance, via the design ideas including parametric, standardization and template introduced into the design, the stencil CAD system of the auto panel die mould structure design was exploited based on the UG flat roof. Getting across the example application of some vehicle type back floor board joint board drawing and extending structure design, it was validated that mould design time was being shortened the six days compared with the customary twenty days, and the whole design work of the mould was completed within one or two days. The results show that this CAD system can increase the designed efficiency, predigest the design course, and enhance the standardization degree of the mould design.