Objective To compare the results of treatment for type Ⅰ endoleak after thoracic endovascular aorticrepair (TEVAR) for Stanford B aortic dissections with stented elephant trunkand re-TEVAR.Methods From 2009 March to 2013 January, 20 patients with type Ⅰ endoleak after TEVAR were evaluated in Beijing Anzhen Hospital.Accordingto different operations, 20 patients were divided intotwo groups: 12 patients treated with stented elephant trunkand 8 patients treated with re-TEVAR.The mean time of follow-up was 6.53±7.60 months.Results There were no significant differences inbaseline characteristics between 2 groups except for gender (p=0.049).Although the operation time was longer in stented elephant trunk group (p=0.007), the incidence of recurrent endoleaks was lower in stented elephant trunk group (p=0.014).There were no significant differences in follow-up mortality between 2 groups (P=1.000).Conclusions Stented elephant trunk is more effective technology than re-TEVAR in treatment of type Ⅰ endoleak after TEVAR for Stanford type B thoracic aortic dissections.However, the results of long term follow-up remain to be studied.