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目的:介绍四圈扩弓簧矫治器的原理、特点、改良设计及临床应用效果。方法:结合典型病例介绍四圈扩弓簧的制作、戴入和调节以及改良设计。结果:通过病例分析发现经18个月的治疗,6宽度可扩大9.65 mm,3宽度扩大5.20 mm,6度扩大3.60 mm,3宽度减少0.45 mm。结论:四圈扩弓簧是一种性能良好,值得推广使用的扩弓矫治器。“,”Objective: The aims of this study are to investigate the working mechanism, the characteristics, the clinical application and the suggested modification of the Quad Helix appliance. Methods: A 7-year-old, female patient with Pierre-Rokin syndrome, who was preformed with palatorrhaphy at 21-month-old treated by using a Quad Helix appliance for one year. Results: After one-year treatment, the wide between the maxillary first molars increased 9.65mm, and the wide between maxillary canines increased 5.20mm. The wide between the mandibular first molars also increased 3.60mm, however the wide between mandibular canines decreased 5.20mm. Conclusion: The Quad-helix appears to be a successful Orthodontic appliance to expand the narrow maxillary or mandibular arches.