Digital medical technology is inevitable trend in the future orthodontic treatment. The robotic technology is used to assist orthodontics archwire bending clincally, and the digital expression of orthodontic archwire is prerequisite of the robotic bending. Because of the individuation of human tooth arrangement and complexity of archwire shape design, it is difficult to realize the digital expression of individual archwire. This paper present a method of the interactive adjustment for individual orthodontic archwire. Based on reference points on bracket, it’s defined that orthodontic wire curve is composed of the straight line segment for bracket and the transitional curve segment. And the transitional curve segment is constructed by the mathematical model of 3th order Bezier curve. Refer to process of bending wire by hand, the mathematical model and model library about special function arch curve are established based on the discrete and combinatorial method. The method of interactive adjustment for individual orthodontics archwire is studied by adjusting position of the straight line segment for bracket, shape changes of the transitional curve segment, selecting the position and type of special function arch curve. The experiment is achieved in the interactive adjustment software designed on the Labview software platform. The result shows that the method is feasible and effective.