分析了平面曲线和空间曲线拟合过程的区别；引入运动坐标系、曲率向量、密切平面等概念，建立了空间曲线拟合的数学模型，并采用了不同形状的空间曲线对拟合方法进行了验证-analysis of the plane curve and space curve fitting distinction; Introduce sports coordinates, Curvature, Plane close concepts, the establishment of a space curve fitting