本文介绍了ＡｕｔｏＣＡＤ－ＡＭＥ实体造型的特点及其图形交换文件ＤＸＦ的文件格式，通过对ＡｕｔｏＣＡＤ三维实体造型的实体几何信息和拓扑信息的提取与转换，利用二叉树结构实现了有限差分网格的自动剖分，并给出了相应的计算机流程。 In this paper, the characteristics of AutoCAD-AME solid modeling and DXF file format are introduced. By extracting and transforming the solid geometry information and topology information of AutoCAD 3D solid modeling, the finite difference mesh is automatically realized by using binary tree structure Points, and gives the corresponding computer process.