Objective: To study changes of electrocardiogram(ECG) in patients with acute aortic dissection.Methods: The alternations of ECG 13 patients with acute aortic dissection were analyzed.Results: Of 13 patients with acute aortic dissection,the ECG of 9 cases existed abnormal.Conclusion: The manifestations of ECG in patients with aortic dissection had no specific.However,the abnormal ECG is one of misdiagnosises for patients with acute aortic dissection.