Shortcomings such as inadequate information and illegitimate connection existed in describing product Computer Aided Design (CAD) modeling process with directed graph and its adjacency matrix.

• 摘要通过分析产品计算机辅助设计建模过程的表示方法，指出有向图及其邻接矩阵表示建模过程存在信息量不足和连通错误等缺陷。