Using the graph modular as the basic cell of product structure modelling, we put forward a graphics substitution approach to edit the structure model, and present a set of useful methods to operate the graph modular. The maping procedure from function to structure is realized. 本文以图形单元作为产品结构建模的基本单位,提出了进行产品结构模型编辑的图形置换技术,给出了实用、方便的单元操作方法,实现了基于功能设计图形结构的过程。