Based on fuzzy mathematics theory,a new concept of fuzzy arc and some coherent definitions are proposed,and if a planar simple curve goes to an arc,a fuzzy arc can be given.

• 基于模糊数学的基本理论；介绍和讨论了一个新概念-模糊圆弧；如果一个二维平面上的简单曲线段趋近于一个圆弧；就可以求出它的模糊圆弧.