Objective：To investigate the imaging features of limited intimal tear（LIT）of ascending aorta in patients with acute aortic syndrome（AAS），and compare the imaging differences between LIT and other types of AAS. Methods：CT angiography（CTA） data of 212 patients with AAS and 212 normal controls were retrospectively enrolled. There were 120 cases of aortic dissection（AD）， 52 cases of intramural hematoma（IMH）and 40 cases of LIT. The imaging parameters included maximal diameter，minimal diameter and area of the ascending aorta at the lesion，adjacent normal ascending aorta and descending aorta at corresponding level respectively. Aortic remodeling index was calculated as maximal diameter/minimal diameter. Results：The maximal diameter of involved ascending aorta in LIT group were larger than those in AD group and IMH group（P ＜ 0.05），the remodeling index was also higher than that in the AD group and IMH group（P ＜ 0.05）. Binary logistic regression analysis suggested that the maximal diameter of ascending aorta was an independent predictor of LIT occurrence（OR：1.533，P ＜ 0.001）. Conclusion：The imaging parameters of LIT are different from those of other types of AAS lesions. When the maximal diameter of the ascending aorta was greater than 40.5 mm in patients with suspected AAS，LIT should be considered clinically.