Objective To study the stress distribution of distally moved dentition with miniscrews in the external oblique line area when the traction hooks of different lengths were used to place different positions by the three-dimensional finite element method. Methods Construction of traction hooks with heights of 2 mm and 7 mm respectively were fixed between the lateral incisors and the canine brackets and between the canines and the first premolar brackets, and constructed four kinds of three-dimensional finite element models of distally moved full dentition with miniscrews. Load 3N force/side between the traction hook and the miniscrews. the maximum von Mises stress and initial displacement of the mandibular teeth and dentition under four loading conditions were analyzed. Result When the traction hook with a height of 7mm is placed between the lateral incisor and the canine, the lower central incisor rotates clockwise, but the central incisor rotates counterclockwise under the other three working conditions.In the four working, the mandibular molars rotate counterclockwise. Conclusion Through three-dimensional finite element analysis,the influence of tooth movement by different traction hooks on in distal lower dentition was elucidated.With a full understanding of the biomechanical mechanism, proper selection of traction hook and placement can achieve correct distal movement of the entire mandibular dentition.