Blood blister like aneurysms is very easy to rupture, especially during and after surgery. Once found, it should be treated promptly. Treatment includes direct clipping, suture artery reconstruction,aneurysm wrapping,internal carotid artery occlusion and endovascular treatment.In this article, we investigate the characteristics, clinical outcome and treatment strategy of blood blister like aneurysms of the supraclinoid carotid artery.