After successful anesthesia, the surgical field was routinely disinfected and toweled. A subxiphoid to suprapubic median incision was made in the abdomen, and the abdomen was incised layer by layer, and the small intestine was found to be adherent in a mass on exploration, and the liver and spleen were normal. The retroperitoneal renal artery was limited to aneurysmal dilatation of the subaortic artery with a maximum diameter of 5 cm, and the iliac artery was not dilated. The small intestine was pushed to the right side of the abdomen, and the retroperitoneum was revealed after longitudinal dissection to expose the abdominal aorta. 2 cm below the right renal artery, the neck of the aortic aneurysm was dissected, and the vesselloop was prepositioned, and dissected distally to reveal the bilateral common iliac arteries, and the vessel loop was also prepositioned. under the renal artery, the aorta was blocked above the aneurysm, and the bilateral iliac arteries were blocked at the same time. The lumbar artery was ligated with sutures with spacers, and no intestinal ischemia was seen after blocking the inferior mesenteric artery. After intravenous administration of 30 mg of heparin, the aortic aneurysm was completely dissected below the neck of the aneurysm, and the thick end of the 16-8 mm Gore “Y” artificial vessel was trimmed and end-to-end anastomosis was performed with the abdominal aorta (continuous external suture, Gore CV4 suture), followed by end-to-end anastomosis of the artificial vessel with the bilateral common iliac arteries (continuous external suture, Gore CV6 suture), respectively. CV6 suture). The anastomosis was compressed to stop bleeding. After releasing the block, the distal artery of the anastomosis was checked for good pulsation, and 250 ml of 5% sodium bicarbonate was administered intravenously. The abdomen was closed layer by layer after inventorying the gauze and instruments without errors. The operation went smoothly with intraoperative bleeding of about 250 ml, which was recovered by Cellsaver and returned to the infusion. The patient was returned to the ICU safely after the operation.