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Objective:To discuss the effort of the distraction osteogenesis technology to treat the serious micrimandibular deformity with OSAS.Methods:Choose a typical case and set retractors at the two sides of angulus mandibulae.Results:After the treatment of five days,the symptom of OSAS alleviated obviously and after the treatment finished,all the symptom disappeared.Conclusion:this technology neednt implant bone to extend two sides of mandibula.Operate easily,high security,less complications and the effect obvious excelled routine surgery.It also can reduce absorbability of bone and traction of soft tissue,simultaneously increase the stability of surgery.So this technology can really achieve the aim at curing the OSAS.