Abstract: Complex abdominal aortic aneurysms（CAAA）generally refer to shortneck abdominal aortic aneurysms（AAA）or abdominal aortic aneurysms involving visceral branch arteries.The treatment difficulties are mainly reflected in the adequate assessment of the proximal anchoring area of the neck and the revascularization of the visceral arteries.At present，the main techniques are “parallel stent graft”，“fenestrated” and“branched stent”.Parallel stent is represented by “chimney stents”，and it is usually used in highrisk patients in emergency situations or who are unavailable for the fenestrated stents.“Fenestrated stent graft”，as the main method for treatment of CAAA in recent years，has good safety and effectiveness，and gradually develops from a simple fenestration to a “fenestrated+branched”combination.The above technologies have their own advantages and disadvantages.This article will briefly explain various techniques for the treatment of complex abdominal aortic aneurysms，and provide some evidence for the endovascular treatment strategy of CAAA.

Key words: complex abdominal aortic aneurysm, endovascular repair, parallel stent, fenestrated, branched stent