Abstract: 【ABSTRACT】Objective: To explore the application and clinical therapeutic effect of thoracic aortic covered stent implantation with insufficient proximal landing zone.Methods:From January 2005~October 2015,86 cases of our hospital during the period of anchoring area less than patients with thoracic aortic lesions as the research object,all the patients were coated carotid stenting,which is completely covered in group A left subclavian artery opening,group B for part of the cover opening left subclavian artery,the two sets of double arms systolic pressure difference,LSA enhancement and postoperative leakage conditions were compared.Results:All patients were successfully placing stents,A set of left and right sides of the double arm systolic blood pressure differential comparative difference was statistically significant (P＜0.05); And group B left and right sides of the double arm systolic blood pressure differential comparative differences had no statistical significance (P＞0.05); At the same time,the two groups in the LSA enhancement and incidence of leakage of comparative difference was statistically significant (P＜0.05). Conclusion:In clinical use of anchoring area was less than the thoracic aorta covered stent implantation,the treatment scheme according to the indication of bilateral carotid artery and vertebral artery blood supply were evaluated and corresponding.