Abstract: Objective: To analyze the tooth movement tendency during anterior retraction with micro implant and sliding method in the customized lingual appliance when traction position is different. Methods: An entire 3-D finite element (FEM) model was constructed, including dentition, periodontal ligament (PDL), alveolar bone, and customized lingual appliance. Using this 3-D FEM model, at different traction positions, mesial or distal to the canine, the anterior teeth and posterior teeth movement tendency during anterior retraction in three dimensions was analyzed. Results: When the lingual anterior retraction hooks (LARHs) were placed distal to the canine, the retraction amount in anterior teeth was more uniformly distributed, dentition constriction appeared in canine and second premolar area, whereas the vertical "bowing effect" was more obvious. Conclusion: During space closure by customized lingual appliance, it is better to locate LARHs distal to the canine. In this way, the decrease of intercanine and interpremolar dental arch width counteracts transverse "bowing effect" effectively. Due to the obvious "bowing effect" in vertical, 10 degrees reverse curve arch wire is necessary to counteract the side effect.