We experienced 12 patients with the abdominal aortic aneurysm during last 31 years [Dec. 1958 ulcornerSep. 1989]. Among them, 10 patients were reviewed. They were all male. The age ranged from 34 to 80 years with the mean age of 59.4 years. The etiology of the aneurysm was atherosclerotic in 8, mycotic in 1, and aortitis in 1. The location of the aneurysm was infrarenal in 8, and suprarenal in 2 cases. Aneurysmectomy and Dacron Y-graft interposition in 8 cases, and lease with Teflon Y-graft were made. In another 1 case, long thoracoabdominal bypass surgery was made. The operative mortality was 30%[3cases]. The postoperative complications were respiratory complications[3cases], acute renal failure[2cases], bleeding[lease], mechanical ileus[ lease], and peritonitis[lease].