数据结构设计是ＣＡＤ／ＣＡＥ／ＣＡＭ集成系统的关键技术，数据结构的好坏直接影响集成系统的性能。本文以几何模型、绘图模型及分析模型的数据结构为例，论述了集成系统中各模块的数据结构的基本内容及其相互关系，提出了一种多模型下分模型管理的统一数据结构的设计思想，其最大特点是用统一的数据库进行管理，各模型间数据的相互利用是直接引用，从而保证数据的完整性和一致性，减少数据冗余度。并以局部数据结构为例，说明了数据结构的实现过程，最后指出了进一步的研究方向。 Data structure design is the key technology of CAD / CAE / CAM integrated system. The quality of data structure directly affects the performance of integrated system. In this paper, taking the geometric structure, the drawing model and the data structure of the analysis model as examples, the paper discusses the basic content of the data structure of each module in the integrated system and its interrelationship, and proposes a unified data structure design of multi-model under the sub-model management Its main feature is that it is managed by a unified database. The mutual utilization of data among models is a direct reference to ensure the integrity and consistency of data and reduce the data redundancy. Taking the partial data structure as an example, the realization process of the data structure is illustrated, and finally the further research directions are pointed out.