The relationships of polygons arcs nodes are the key method of describing the spatial topological attributes of polygons. This paper introduces a new clipping algorithm which improves Weiler Atherton algorithm for keeping the topological attributes.

• 多边形 -弧段 -结点之间的联系是描述多边形空间拓扑关系的重要方法 ；为了维护裁剪前后这种拓扑关系的正确与继承性 ；本文在 Weiler- Atherton算法的基础上提出了一种新的算法 .