本文通过选用下切牙区下颌运动的描记，探讨用ＦＲＩ矫治器矫治安氏ⅡⅠ错，下颌运动的变化，发现型对下颌边缘运动具有引导作用，随着矫治后深覆的改善，运动轨迹随之改变；通过矫治使下颌运动轨迹重复性增加，说明下颌运动可作为一种功能监测手段，帮助分析、诊断、评价正畸疗效 In this paper, mandibular movement of the lower incisors was used to describe the mandibular movement of the Angle Ⅱ Ⅰ malocclusion treated with FRI appliance. It was found that the popliteal gyrus played a guiding role in the movement of the mandibular edge. With the improvement of deep overburden, The trajectory changes accordingly. The orthodontic effect can be analyzed, diagnosed and evaluated by using mandibular movement as a functional monitoring method through the repetitive increase of mandibular motion trajectory.