Abstract:Objective：To summarize our experience in the treatment of 26 cases of infra-renal abdominal aortic aneurysm(AAA). Methods：Clinical data of 26 patients with infra-renal AAA treated with open surgical repair in recent 5 years were retrospectively reviewed. The diagnosis of AAA in all the patients was confirmed by imaging examination.21 patients were operated electively.Of them 5 patients whose aneurysms ruptured before operation underwent emergency surgery.All of the 26 cases were treated by aneurysmectomy and prosthetic grafting. Results：Among the five patients whose aneurysms ruptured before operation,two died in perioperative period.There was no operative mortality in the other cases. The overall mortality rate was 7.7%, and the mortality rate of emergency operation was 40.0%.Tweenty-four patients were followed-up for 1 year to 5 years.The 1,3,and 5-year survival rates were 96%,88%and75% respectively.No death was caused by aneurysm or the operation during follow-up. Conclusions：CT angiography is a credible method in the diagnosis of AAA.The aneurysm diameter is not an absolute operative indication.Risk factors of open operation of AAA are old age,severe cardiopulmonary diseases, and renal dysfunction.Open surgery is still the primary treatment of AAA.