Abstract: CAD technology is applied in development of sanitary ceramic products.Based on the analysis of structures of the sanitary ceramic products,the architecture of sanitary ceramic products CAD system is determined,and the design procedure is clarified.UG/OPEN KF is used to integrate design parameters,engineering experience and industrial standards.NURBS and combined curves are introduced to model feature structures as control curves.Some key technical problems,such as products diversity,parametric feature relevancy and model modification,are solved.A general CAD software,Unigraphics,is chosen as the platform for the specific-purpose application development of the sanitary ceramic products CAD system,which is developed with VC＋＋ and UG/OPEN.The specific-purpose CAD system can help designers design products rapidly and strengthen development capability.