Objective To investigate the application value of ultrasound and vascular multi-slice spiral CT (CTA) combined diagnosis in typing of Stanford A aortic dissection. Methods 78 cases of patients with highly suspected Stanford A type aortic dissection were examined by ultrasound and CTA to know their types. The operation results were taken as the golden standard. Results The accuracy and sensitivity of ultrasound and CTA in the diagnosis of Stanford A type aortic dissection (93.59%, 100%) were significantly higher than that of ultrasound (69.23%, 72.58%) and CTA (74.36%, 88.71%) (P<0.05). There was no difference of specificity (P>0.05). There were no differences between the three groups in the combined diagnosis of A1 type, A2 type and A3 type (P>0.05). The probabilities of CTA showing intimal flap, scope involved by intimal flap, false lumen thrombus, aortic arch involvement and aortic arch branches involvement were higher than those of ultrasound while the probabilities in showing decreased heart function and aortic regurgitation were significantly lower than those of ultrasound (P<0.05). Conclusion The accuracy and typing accuracy of ultrasound and CTA in combined diagnosis of Stanford A type aortic dissection are relatively higher, which also can help to know the intimal flap and involved scope and false lumen thrombus, etc..