Analysis the defaults of the fitting curve at present, find a optimum theory of fitting curve with the minimum error of the radius is indicated,and its feasibility is proved by samples.

• 分析并指出了现行各种曲线拟合方法的缺陷,提出了一种以曲率半径误差最小为原则的双圆弧拟合曲线的优化方法,通过实例验证了这种新型方法的可行性。