Abstract: By traditional way,it can be get a velvet curve that passes thought the reference points which are confirmed,but it just can be get one curve insufficiency.Spline curve has its advantage compared with others curve,so it is used spline curve to solve problems in application,and put forward a ameliorated algorithm base on traditional algorithm,so it can be get a new curve that has the same reference points as old curve.By this way,it is colonized spline curve’application on practice work.