The use of an extracranial-intracranial (EC-IC) bypass has been a choice to improve the safety of parent vessel occlusion during the management of aneurysm. However, the prognosis and subsequent patency of bypass graft are variable and have seldom been managed by endovascular treatment. A 38-year-old gentleman presented to our hospital with intermittent headache. Subarachnoid hemorrhage caused by an internal carotid artery aneurysm was disclosed on the subsequent examination. He received an EC-IC bypass later. However, graft stenosis was found during follow-up. To solve the stenosis, an endovascular stent was inserted by us. There is seldom report of endovascular treatment of the graft. Here we share our experience under such circumstances.