Background: Three-dimensional reconstruction technology is used to measure the volume of the descending aorta and to evaluate the characteristics of the remodeling of the descending aorta with different lengths after frozen elephant trunk (FET) treatment of acute type A aortic dissection (ATAAD). Methods: Three-dimensional reconstruction of the computed tomography angiography (CTA) of 48 cases ATAAD patients preoperatively and 1-3 months postoperatively was performed to measure the total volume of the aorta lumen model, descending aorta lumen volume, abdominal arterial lumen volume, as well as the true lumen (TL) and false lumen (FL) of each segment. The postoperative volumetric ratio was subtracted from the preoperative volumetric ratio, and the final distinction was made according to our remodeling classification criteria. Result: There were 13 (76.47%) positive remodeling cases, 9 (42.86%) stable remodeling cases, and 2 (20.00%) negative remodeling cases in the long FET group. In the short FET group, there were 4 (23.53%) positive remodeling cases, 12 (57.14%) stable remodeling cases, and 8 (80.00%) negative remodeling cases. As shown above, the data was obtained from the volumetric measurement and the morphological analysis of the three-dimensional reconstruction model. Conclusion: According to our classification criteria, long FET can promote the positive remodeling of the descending aorta, and it is meaningful for three-dimensional reconstruction to be used in volume measurement and morphological research.