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分析了结构设计在ＣＡＤ中的意义和存在的问题，提出解决问题的探索性途径。进而讨论“自顶而下”的模具ＣＡＤ的意义和关键技术，提出了新的装配数据结构模型以及“虚零件”、“逻辑造型”等新概念。
The significance and existing problems of structural design in CAD are analyzed, and the exploratory ways to solve the problems are put forward. Then discuss the meaning and key technology of “top-down” mold CAD, put forward new assembly data structure model and new concepts such as “virtual parts” and “logical modeling”.