Abstract Taking retaining wall design for an example, this paper discusses how to represent the complex process of design in concept form when developing a Road Intelligent CAD System, and puts forward two methods to get the knowledge about road design.

• 本文以挡土墙的智能设计为例，探讨了在开发道路智能CAD系统时，如何用概念化的知识描述复杂的设计过程这一关键性问题，提出了抽象道路设计知识的两种方法。