Objective To investigate the effects of exceedingly expanded retroauricular flaps and fascia combine with autougenous costal cartilage for microtia reconstruction.Methods a 50-ml kidney or clinder-shaped tissue expander was implanted underneth the retroauricular mastoid region fascia, the period of injection was 2-3 months, final volume of the expander reached 70□ 120?ml.static expansion one week.In the second stage, expander was get out and facsia was removed,and pocket was performed.The opposite seventh eight nith autougenous costal cartilage were harvested,three dimensional ear framework was fabricated, enveloped by expanded skin flap and auricularappearance was formed by Negativepressure drainage, after 3 months ,Earlobe transpesitionand concha deepening were performed.ResultsFrom January 2009 to Fibrary 2013, 42 cases of congenital microtia were treated hyexceedingly expanded retroauricular flaps and fascia, one case was operated ahead of schedule because of exposure ,and infection accured in one case during expansion;The cause of expanding was good in the other patients,exposure of cartilage accured in three cases ,repaired with skin flap. All patients were followed up from 3 months to 3 years after reconstruction , the size ,posizition, shape of reconstructed ear were similar to that opposite,there are helix ,antihelix, scapha ,triangular fossa in reconstructed ear, there are stable cephaloauricular sulcus and cephaloauricular angle.and Patients and their parents are satisfied with the results, expected effects are required.Conclusion the method that exceedingly expanded retroauricular flaps and fascia combine with autougenous costal cartilage for microtia reconstruction has low complication , The appearance of the reconstructedear was natural ,look like one intergrated mass, there are stable cephaloauricular sulcus and cephaloauricular angle,is safe auricular reconstruction method.