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在汽车、船舶和模具等的计算机辅助设计当中，复杂曲线和曲面的设计始终是一个核心问题．三次Ｂ样条曲线是一种由给定的控制顶点所形成的控制多边形定义生成的自由曲线，具有Ｃ１，Ｃ２连续性、局部修改性及可扩展性等许多优良特性．孔斯（Ｃｏｏｎｓ）曲面是由给定的４条界曲线（共１６个系数向量）构造而成的曲面片，它能够通过叠加和修正来产生满足需要的曲面．在ＡｕｔｏＣＡＤＲ１３环境下，应用了三次Ｂ样条曲线和孔斯曲面，成功地进行了轿车车身的外形设计．
The design of complex curves and surfaces has always been a central issue in computer-aided design of cars, ships and molds. The cubic B-spline curve is a kind of free curve generated by the definition of control polygon formed by a given control vertex. It has many excellent characteristics such as C1, C2 continuity, local modification and expansibility. The Coons surface is a patch of surfaces constructed from a given set of four bounding curves (a total of 16 coefficient vectors) that can be shaped and shaped to produce the surface that suits your needs. In AutoCADR13 environment, the cubic B-spline curve and the kongs surface are applied, and the car’s body shape design is successfully carried out.