Thoracic aortic dissection was a catastrophic disease with change quickly,and the characteristic of thoracic aortic dissection was acute onset,complex,progress rapidly,difficult to diagnosis,and highly misdiagnosis rate.So the fatality rate of thoracic aortic dissection was high,which easy caused medical disputes.Even so,the cause of the formation of thoracic aortic dissection in detail is not clear,and many risk factors associated with the occurrence of thoracic aortic dissection.These including high blood pressure,gender (male),aortic normal aging,drug using,atherosclerosis,genetic disease and inflammatory diseases,etc.