Objective To explore the dual-source CT angiography in the diagnosis of congenital aortic valve leaf malformation. Methods 100 cases of patients were selected during April 2013-April 2015 in our hospital diagnosed as congenital aortic valve leaf malformation , randomly divided into two groups by random number table method, the team of 50 cases of patients, 50 patients with the control group, the group USES the dualsource CT angiography for testing, control group adopts the thoracic echocardiography examination, selection test of CT data are uploaded to the original image workstation. For detection of original data and then to sagittal and coronal position and processing the relevant technology of the virtual endoscopy, the type, the performance of aortic valve leaf malformation valve thickening, calcification, curly, left ventricular enlargement, and other abnormal phenomenon such as merger. For patients with aortic maximum diameter, left ventricular end-diastolic and the thickness of the aortic valve is analyzed. Results The results showed that the two groups of patients compared the indicators are no significant difference(P>0.05). Conclusion Dual-source CT angiography in congenital aortic valve leaf malformation has obvious diagnostic value, almost the same with the testing results of echocardiography, can accurately diagnose congenital aortic valve leaf malformation, clinically because of its simple operation, high accuracy, small damage to patients, to promote its widespread use.