Objective To explore the ideal one-stage method in the treatment of temporomandibular joint(TMJ) ankylosis complicated with microgenia.Methods One stage operation surgery is performed to treat TMJ ankylosis complicated with chin deformity.Pseudo-arthro-plasty is performed with autogenous tensor fascia lata muscle and with horizontal osteotomy forward in mandible chin area for microgenia.Results From March 2003 to March 2008,11 cases were treated.For all the patients,one stage TMJ and chin plastic methods were used to restore joint function and repair external shape of the face.Exercise of joint flexibility was done after operation.Patients were followed for 6-12 months.Oral function is restored and patients can chew normally.For 9 cases,the opening of the mouth is above 2 fingers with satisfactory external shape.Conclusion One stage operation is an ideal therapy to treat TMJ ankylosis complicated with microgenia.It can restore the oral function and external shape.