Aim To study the detection rate of coronary artery aneurysm(CAA) in Chinese adults under coronary angiography(CAG),its clinic features and prognosis.Methods Retrospective studies were conducted of the clinical features,treatment and outcome of 8628 patients under CAG.Results Among the 8628 patients,80 had CAA,the total detection rate of was coronary artery aneurysm 0.927%.Among these patients,42 had myocardial infarction,and 72 had narrowing coronary artery(stenosis 50%).Among the 80 cases of CAA,61 arteries had thrombosis.No coronary artery aneurysm had ruptured.Conclusion The detection rate of coronary artery aneurysm in the studied coronary angiography population was 0.927%,coronary artery aneurysm could be responsible for myocardial ischemia and myocardial infarction.