1, ECG: ECG is the earliest, most commonly used and most basic diagnostic method in the diagnosis of coronary heart disease, ECG is easy to use, cheap, easy to popularize, when the patient’s condition changes, it can capture the changes in a timely manner, and can be continuous dynamic observation and various load tests, in order to improve its diagnostic sensitivity. 2.Nuclear myocardial imaging: According to the medical history, this top examination can be done when angina cannot be ruled out by ECG examination. Nuclear myocardial imaging can show the ischemic area and clarify the site and extent of ischemia. Combined with exercise test and re-imaging, the detection rate can be improved. 3.Coronary angiography: It is the “gold standard” of coronary artery disease diagnosis. It can clarify the presence or absence of coronary artery stenosis, the location, degree and extent of stenosis, and can guide the measures to be taken for further treatment. At the same time, left ventriculography can be performed to evaluate cardiac function. 4.Echocardiography: Cardiac ultrasound can examine heart morphology, ventricular wall motion and left ventricular function, and is one of the most commonly used examination methods. 5.Cardiac enzymatic examination: It is one of the important means for the diagnosis and differential diagnosis of acute myocardial infarction. Clinically, a definite diagnosis of acute myocardial infarction can be made on the basis of definite enzymatic changes such as serial changes in serum enzyme concentration and elevation of specific isoenzymes. In addition, blood lipid and blood glucose should be checked regularly because coronary heart disease is generally caused by atherosclerosis, and atherosclerosis has a great relationship with hyperlipidemia and diabetes.