Abstract: To describe and smooth curves and curved surfaces in finite element simulation, a method for modifying die surfaces in plate deforming simulation is proposed. The description of the surfaces is based on point representation, and the fairness of a surface is represented with the difference between the original points and those after modification. A simulation system is implemented by use of finite element software ABAQUS. An example of simulation is presented, showing that the proposed method and the simulation system is applicable in die surface modification assisted with finite element method.