The theory of spline function especially B spline function has been greatly developed sinee 1960s,It has become one of the main mathematical tools in the Computer Aided Geometry De- sign(CAGD).

• 60年代以来，样条函数特别是B样条函数的理论有了很大发展，已经成为计算机辅助几何设计（CAGD）工作中的主要数学工具。