In the light of using top down method in the design of product with CAD, a method of feature design, which chooses proper shape feature as the datum for next design step, is presented.
针对自上而下的计算机辅助机械产品图形设计，提出了适应这种设计思维的特征设计方法，即选择合适的形状特征，作为进一步的详细设计的基准。
This paper deals with an integral-design-oriented stamping die CAD system for carriage based on the mapping between function and structure, which supports top-down process of product design.
基于现代设计方法和计算机信息技术，开发了基于功能-结构映射、支持自上而下整体设计的客车件冲裁模CAD 系统。
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