It is convenient and quick when using radian meter to measure skates arc. Measurement and reconstruction method for skate-arc were further studied. In arc reconstruction, the small arc-segment contact method was compared with the iterative reconstruction based on curvature interpolation and fitting put forward in this paper. The latter was obviously superior to the former. The skate arc shape generated from the above iterative reconstruction was expressed by use of a large number of data points, so arc-spline fitting method for data points was deeply studied. These parameters to affect the fitting error of arc-spline were detailedly analyzed and deduced. The adjustment method about these parameters was obtained. When using this fitting method, the skate arc expression generated from iterative reconstruction was greatly simplified. It’s very convenient for description and processing for skate arc shape. The above achievement was applied in the NC skates reconstruction system developed by the author.