Objectives: Aim to evaluate begin results of retroperitoneal approach to abdominal aortic at Thoracic- Vasculair sugery department Cho Ray Hospital. Material and method: Cross- section studies from January - 2007 to December- 2010 with patients operated retroperitoneal approach to infra renal AAA. Results: 24 cas infrarenal AAA has performed incision at the left from below flank extending the lateral border of the rectus sheath to umbilical. 21 cas (87.5 percent) in men, 3 cas (12.5 percent) in women, mean age 72 year old, 24 cas (100 percent) abdominal or back pain. Mean diameter of aneurysms 6 cm, 24 cas (100 percent) aneurysms or atherosclerosis iliac- femoral artery. 1 cas (4 percent) previous abdominal surgical procedure, 1 cas (4 percent) Dacron "tube" graft 16 size is selected and 23 cas (96 percent) use to bifurcation Dacron graft (Y) 16-8 size. The left side: anastomosis to iliac artery 21 cas (91 percent) and femoral 2 cas (9 percent), the ritgh side anastomosis to iliac artery 19 cas (83 percent) and femoral artery 4 cas (17 percent). Mean time of operation 4 hour and remove ICU department .10- 18 hour. Hospital length of stay from 7 to 10 day. 1 cas (4 percent) patient die due to long time respiratory failure, 1 cas (96 percent) abdominal wall hernia. 22 cas outcome well. Conclusion: AAA happens elderly most associate hypertension, ischemie coronary, COPD, chronic artery obstructive, diabetes...cause by high risk of .deaths. Advantages of retroperitoneal approach AAA resection aim to degree complication for patients.