Purpose: The aim of this study was to compare the efficacy and outcomes of endopyelotomy, Acucise endopyelotomy, and laparoscopic pyeloplasty for patients with ureteropelvic junction obstructions. Materials and Methods: We studied 45 patients with ureteropelvic junction obstructions who underwent minimally invasive surgeries between January 2001 and April 2007. Patients were divided into three groups according to operative procedure: group I, endopyelotomy(n=17) group II, Acucise endopyelotomy(n=12; and group III, laparoscopic pyeloplasty(n=16). Results: The mean patient ages in the three groups were 42.7±17.2 years, 48.8±14.1 years, and 49.5±13.6 years for groups I, II, and III, respectively. The mean stricture lengths were 0.99±0.25cm, 0.93±0.10cm, and 1.03±0.38 cm for groups I, II, and III, respectively, and were not significantly different among the groups(p＞0.05). The mean operating time for group II(55.7±25.3 minutes) was shorter than that for group I(131.7±30.5 minutes) and