Background: The surgical approach for treating supravalvar aortic stenosis has evolved from plain patch technique to 3-dimensional patch repair. However, this 3-dimensional patch is complex, time-consuming procedure. We propose a modified simple sliding aortoplasty for supravalvar aortic stenosis without using foreign material. Material and Methods: Between June 2001 and December 2005, 7 children (mean age 7 years; range 3 to 12) with supravalvar aortic stenosis were surgically treated. Four patients had clinical features of Williams syndrome. Three patients had undergone right pulmonary artery angioplasty due to right pulmonary artery stenosis. One patient had undergone aortic valve commissurotomy due to bicuspid aortic valve. Results: There were no in-hospital deaths. No patient required repeat surgery. Cardiopulmonary bypass mean time was 66.3짹15.8 minutes (range, 51 to 94). The mean cross-clamp time was 28.9짹11.7 minutes (range, 19 to 52). All patients were discharged from the hospital with no problems. Patients were followed-up for a mean duration of 29.7짹21.8 months (range 2 to 55). All patients were underwent postoperative echocardiography or computed tomographic scan, which showed good results of the surgical correction. Conclusions: For the patients presented in this study, the mid-term results of modified simple sliding aortoplasty have proved promising. Long-term follow-up is required to determine if this technique ultimately improves aortic anatomy significantly enough to decrease the incidence of postoperative aortic stenosis and insufficiency, and results in fewer operations.