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本文提出一种优化双圆弧拟合的新算法。它采用的方法是用改变双圆弧联结点的切线斜率，使双圆弧与样条曲线间的法向误差达到最小（或小于允许误差）。与其他双圆弧拟合方法相比较，该算法计算简单、线性、并可消除拟合曲线的不稳定性；拟合效果快速、良好。可直接应用于雕塑曲面的ＣＮＣ加工中．
This paper presents a new algorithm to optimize double arc fitting. The method used is to minimize the normal error (or less than the allowable error) between the double arc and the spline by changing the tangent slope of the double arc joint. Compared with other double arc fitting methods, this algorithm is simple and linear, and can eliminate the instability of fitting curves. The fitting effect is fast and good. Can be directly applied to the sculpture surface CNC machining.