In this paper,the cubic B-spline curve is introduced to fit the axis of arc dam,and to decide the arc dam shape base on the geometric properties of B-spline curv.

• 基于B样条曲线的几何特性,在拱坝体型设计中,用3次B样条曲线来拟合拱坝中轴线,用"密切圆包络法"法来计算拱坝的上、游拱曲线,进而确定拱坝体型。