Based on the idea of energy optimization

a new method for shape modification of the B-spine curve is proposed. First

using an analogy between the B-spline curve and the curve element of finite element method

and making the external load acting on the curve be equivalent to the end force into the element

the internal energy functional equation of the B-spline curve and the energy functional equation of the load are constructed respectively. The energy change of the B-spline curve with the change of the load

a new curve is generated by solving an optimization problem of the change of the energy. Using this approach

the local or total modification of the curve can be accomplished.