(1) Electrocardiogram Advantage: It can detect myocardial ischemia and arrhythmia, and is a common method to diagnose coronary artery disease. It includes ECG at rest, ECG during angina pectoris, stress test, ECG continuous monitoring (Holtter), etc. It is inexpensive. Disadvantages: high misdiagnosis rate and inaccurate localization of lesions. (2) Radionuclide (ECT) examination Advantages: It can understand the extent of myocardial ischemia and infarction and whether the infarction of the myocardium is reversible. Disadvantages: relatively expensive, cannot find the cause of infarction, and cannot detect lesions early. (3) Echocardiogram Advantages: To understand the action of the ventricular wall, the presence of ventricular wall aneurysm, the activity of the heart valves and the function of the left heart at low cost. Disadvantages: low accuracy of coronary artery evaluation and early detection of coronary artery lesions. (4) Myocardial enzymatic examination Advantages: SGOT, CKP, etc. to understand the degree of myocardial injury and recovery process. Disadvantages: Can not detect the site of coronary lesion, and can not diagnose coronary artery disease at an early stage. (5) Coronary angiography Pros: It can clarify the extent and degree of lesions, provide a basis for choosing treatment methods (surgery, intervention, drugs) and can assess the risk, and interventional treatment can be performed as needed. Disadvantages: requires hospitalization, invasive examination, complicated operation, expensive, certain complications, cannot understand the situation outside the coronary arteries. (6) 64-row CT examination Advantages: short examination time, no trauma; high safety, no side effects; simple procedure, no hospitalization required; high accuracy, accurate understanding of coronary artery lesion site and degree of stenosis, early detection of lesions, can understand the site and area of myocardial infarction. The examination indications are very wide and can also detect lesions outside the coronary arteries; the cost is low, only 1/6 of the cost of other conventional examination methods. disadvantages: high requirements for the patient’s heart rate.