1.Electrocardiogram: It is a common method to detect myocardial ischemia and the presence of arrhythmia for the diagnosis of coronary artery disease. It includes ECG at rest, ECG during angina attack, ECG load test, ECG continuous monitoring (Holtter) and other tests. 2.Radionuclide examination: (1) To understand the myocardial perfusion scan. (2) Scanning of the cardiac blood pool, mainly to observe cardiac function. (3) Metabolic scan, mainly to understand whether the myocardium has survived. (3) Echocardiography: To understand the action of the ventricular wall, the presence of ventricular wall tumors, the activity of the heart valves and the function of the left heart. A stress echocardiogram can also be done to look at different angles to determine if there are abnormalities in the ventricular wall motion of coronary artery disease. 4, myocardial enzymatic examination: troponin, CK-MB, etc. to understand the degree of myocardial injury and recovery process. 5.Multi-row spiral CT coronary artery imaging: It can clearly see the vessels of coronary artery, and if there is stenosis, it can also see the degree of stenosis and stenosis site, and if a stent or a bridge has been placed after coronary artery disease treatment, these vessels can be clearly shown. Therefore, this method can observe the coronary artery disease and the situation after treatment. 6.Coronary angiography: It is currently called the gold standard for the diagnosis of coronary artery disease. It can clarify the extent and degree of lesions, and provide a basis for selecting treatment methods (surgery, intervention, drugs) and assessing the risk.