Abstract:In order to make fast response to market requirement, the technology of parameterization is more and more widely applied to the design and development of product. Currently the technology of parameterization based on 3D CAD systems mainly concerns about design of basic dimension, and seldom about dimensional tolerance. But dimensional tolerance is an important indicator in design. To solve the problem of parameterization in dimensional tolerance, research on the method of dimensional tolerance information in the expression, extraction and labeling for parametric model of parts, a variant design method with dimensional tolerance is presented in this paper. And integrate between variant design method of dimensional tolerance and variant design method of dimension, part variant design method with dimension and dimensional tolerance is synchronization completed. According to secondary develop the parametric CAD software SolidWorks, a part variant design with dimension and dimensional tolerance plug-ins integrated with based on SolidWorks is developed with VC++. As an example, all methods and development of plug-ins are applied to a case study of shaft, and the feasibility is also verified.