摘要
提出了一个基于参数化设计模块的图形管理系统，介绍了基本图元的描述、系统的组成、系统的管理，并成功地应用于自行车计算机辅助设计系统。
The design of a drawing management system based on PDB(paramatric design block),whicl has been successfully used in the bicycle CAD system is introduced in this paper, and the basic drawing element, structure of the system and system management are discussed.
