目的了解ＦＲ－１型矫治器矫治安氏Ⅱ类１分类错牙合的牙牙合变化。方法对２３例生长发育快速期的安氏Ⅱ类１分类错牙合患者采用ＦＲ－１型矫治器矫治，并对治疗前后模型进行牙弓测量。结果１．上颌牙弓宽度增加，长度减小；２．下颌牙弓宽度增加，长度增加，Ｓｐｅｅ’ｓ曲线变平；３．前牙覆牙合、覆盖减小。结论ＦＲ－１型矫正器，能使上下牙弓长、宽、高三维关系发生明显变化，有效地改善安氏Ⅱ类１分类错牙合。 Objective To understand the changes of occlusion of Class Ⅱ division 1 malocclusion treated with FR-1 appliance. Methods Twenty-three cases of Class Ⅱ division 1 malocclusion with rapid growth and development were treated with FR-1 appliance, and the dental arch was measured before and after treatment. Results 1. Maxillary dental arch width increases, reducing the length; 2. Mandibular arch width increased, the length increased, Spee's curve flatten; 3. Anterior crossbite, covering reduced. Conclusion The FR-1 orthosis can significantly change the relationship between the length, width and height of upper and lower dental arch, and effectively improve Class Ⅱ division 1 malocclusion.