目的 设计磁力扩弓矫治器并检验其性能,以确定临床应用的可行性。方法 钕铁硼永磁体经切割、镀铬,制作双轨滑动式磁力扩弓矫治器(ME_1、ME_2型),测试其扩弓力、耐腐蚀性及每一磁体在矫治器上的更换通用性。结果 ME_1、ME_2矫治器最大扩弓力达4.3N及7.05N,磁体耐腐蚀性能良好,磁体更换通用比率为97.5％。结论 磁力扩弓矫治器性能良好。 Objective To design magnetic augmentation appliance and test its performance to determine the feasibility of clinical application. Methods NdFeB permanent magnets were cut and chrome plated to make dual rail sliding magnetic expansion appliances (ME_1 and ME_2) to test their expansion force, corrosion resistance and interchangeability of each magnet on the appliance. Results The maximal expanding force of ME_1 and ME_2 appliances reached 4.3N and 7.05N, respectively. The corrosion resistance of the magnets was good, and the common rate of magnet replacement was 97.5%. Conclusion Magnetic expansion appliance has good performance.