协同设计的版本管理应支持设计全过程，对设计过程中的整个历史过程的版本都应予以保留。如果所有版本采用完整存储，版本存取速度快，但需要大量的存储空间，而且存储的冗余信息量大；若采用差值存储虽然可以节省大量的存储空间，版本的存取速度要受影响。因此本文从数据存储的角度讨论了版本管理的内容，提出两种差值存储模型，构造了版本存储阈值来将差值存储与完整存储相结合，从而有效地在空间效率和时间效率上进行平衡，不仅提高了版本存取的响应时间又减少存储空间。关键字：协同设计 版本管理 完整存储 差值存储 存储阈值Abstract：Version management of collaborative design should support the whole course of design, and all version of design during the course must be stored. Taking full storage of all versions, version accesses fast, but they need a mass of storage space and storing redundancy information of version is very big. Although taking difference storage can save a mass of storage space, version accesses slowly. So in this paper we discuss the content of version management from data storage, and put forward two models of difference storage. Constructing storage threshold unites difference storage and full storage in order to balance space efficiency and time efficiency. It not only improves the answer time of version access but also reduces storage space.Keywords: collaborative design, version management, full storage, difference storage, storage threshold