Abstract:This paper introduces the concept of automated intelligent tire design as basis, and then systemically presents the general framework of CAD 3-D digital tire model design platform, Its modules include the demand representation, demand pre-analysis, product list generation, product list modeling, testing, tires knowledge-base and tire parts-base. The paper also describes the realizing process and key techniques of the product list modeling module, including calculation principle of groove section and groove modeling scheme, and so on. This paper also introduces an improved algorithm of calculating groove centerline; Finally CATIA platform and VBA toolkit-based tire design system has been completed under detailed demand representation type.