Abstract: Current CAD system of cold-punching dies has some problems such as low degree of standardization, weak specificity, behindhand development tool and so on. The basic theory and methods of parametric design and feature-based modeling were thus investigated to develop a UG-based modeling design system for cold-punching dies. With the secondary development tools of UG used, the libraries of both standard parts and common dies were framed, by which the assembly design of any cold-punching dies is available to be completed according to the bottom-up design method. The UG WAVE technology is applied in the modeling process of die parts. Exemplifying the design of a blanking die for car parts in a certain car manufacturer, the modeling design system for cold-punching dies is of significance to improve the efficiency of die design and standardize it.