Mild to moderate stenosis of the coronary arteries is considered coronary artery disease if it is due to atheromatous plaque formation, but not if it is due to other causes. At present, coronary artery stenosis is the most common clinical cause of coronary artery atherosclerosis due to atherosclerotic plaque formation, and mild to moderate stenosis of the coronary arteries due to this cause, resulting in symptoms of myocardial ischemia is coronary heart disease, i.e., coronary atherosclerotic heart disease. In addition, such as myocardial bridges, arteritis, Kawasaki disease, etc. can lead to coronary artery stenosis, these non-atherosclerotic coronary artery stenosis caused by heart disease is not coronary heart disease. For mild to moderate coronary artery stenosis, clinicians need to further combine with auxiliary examination to determine the cause of the disease, timely individualized treatment, so as not to delay the disease leading to the occurrence of acute cardiovascular events.