Thoracic endovascular aneurysm repair(TEVAR) offers a minimally invasive treatment of aortic syndrome involved thoracic aorta. Whereas the procedure for aortic arch aneurysm became more difficulty because of the curvature of the aortic arch and the presence of the supra-aortic vessels, celiac trunk, superior mesenteric arery. Proximal and distal fixation is often limiting for TEVAR. If lesion has short proximal, distal landing zone , the stent graft might cover the origin of important branch vessels on the aorta. Modified Chimney technique(MCT) have been proposed to solve this problem. The authors describe successful there cases of patients who underwent TEVAR using MCT. Case 1 : 49 year old female. The CT scan revealed ruptured aortic dissection(Stanford type B) with collapsed true lumen which entry site is just near left subclavian artery.(Fig.A) In aortography, aortic arch dissection was present 0.2cm distal to the left subclavian artery(Fig.B). We deployed two pieces of thoracic aortic stent grafts across left carotid artery and left subclavian artery through left femoral artery(Fig.B). Because his proximal landing zone is only 0.2cm, thoracic stents were positioned at origin of LCC covering two third of LCC. SMART nitinol stent(8mm X 40 mm) was deployed in to left common carotid artery by MCT(Fig.B). Post-procedure aortography showed no endoleak and other complications. Case 2 : 73-year-old man. The CT scan revealed aortic dissection(Stanford type B) combined with aneurismal dilatation which entry site is just near left subclavian level. We performed aortic stent graft with carotid stenting by MCT. Case 3 : 66-year-old man. The CT scan showed huge descending aortic aneurysm near celiac trunk.Because his distal landing zone is very short 1.0cm, GENESIS stent(8mm X 39 mm) was deployed in to celiac trunk by MCT. and then we deployed two pieces of thoracic aortic stent grafts in descending aorta near celiac trunk. Post-procedure aortography showed no endoleak and other complications.