 Hypertension is well known as the most common cause for AD. The statistics from International Registry of Acute Aortic Dissection IRAD demonstrated that 72.1 of AD patients had a history of hypertension. The hypertension may aggravate hematoma expansion and results in serious consequences. Therefore, effectively blood pressure control may alleviate the severe pain caused by acute AD and lessen the progression of arterial dissection. The control of hypertension is the primary treatment for acute aortic dissection, and should be maintained throughout the entire treatment. Currently, all guidelines recommended to decline the transaortic pressure via controlling the heart rate and blood pressure for AD patient in acute phase. Theoretically, to control the blood pressure to the minimal level meeting the sufficient end-organ perfusion can decrease the risk of vessel rupture as much as possible. Whereas, too much low blood pressure target may increase the mortality of patients. Powell and his colleague found when the minimum blood pressure increased by 10mmHg vs. 70 mmHg, maximal to 120 mmHg for AD patients, the risk of death decreased by 12 OR 0.88, P 0.001. 