There are many ways to diagnose coronary heart disease, including the following: 1, clinical manifestations: angina pectoris is the main clinical symptom of coronary heart disease, according to the angina pectoris onset of site, nature, triggers, duration, mode of relief and other characteristics and accompanying symptoms and signs can be identified angina pectoris and myocardial infarction, it can be said that typical symptoms and signs of angina pectoris and myocardial infarction of coronary heart disease is essential to the diagnosis of. 2, ECG: ECG is the earliest, most common and basic diagnostic method in coronary heart disease diagnosis. 2, electrocardiogram: electrocardiogram is the earliest, most commonly used and the most basic diagnostic method in the diagnosis of coronary heart disease, electrocardiogram is easy to use, easy to popularize, and when the patient’s condition changes, then it can capture its changes in a timely manner, and it can be continuous dynamic observation and various load tests, in order to improve its diagnostic sensitivity. Whether it is angina pectoris or myocardial infarction, there are typical ECG changes. 3.Nuclide myocardial imaging: according to the history, this top examination can be done when angina cannot be excluded by electrocardiography. Nuclide myocardial imaging can show the ischemic area and clarify the location and extent of ischemia. Combined with exercise test and then imaging, it can improve the detection rate. Coronary angiography: It is the “gold standard” for the diagnosis of coronary heart disease. It can clarify whether the coronary artery is stenotic, the site, degree and scope of stenosis, and can guide the measures to be taken for further treatment accordingly. Combined with left ventriculography, cardiac function can be evaluated. 5, ultrasound and intravascular ultrasound: cardiac ultrasound can examine the heart morphology, ventricular wall motion and left ventricular function, which is one of the most commonly used means of examination at present. Intravascular ultrasound can clarify the morphology of the wall and the degree of stenosis within the coronary arteries, which is a promising new technology. It is especially suitable for those who are allergic to contrast agents and cannot do coronary angiography. 6.Cardiac enzymology examination: it is one of the important means for the diagnosis and differential diagnosis of acute myocardial infarction. Clinically, according to the sequence change of serum enzyme concentration and the elevation of specific isoenzymes and other positive enzymatic changes, acute myocardial infarction can be clearly diagnosed. 7, cardiac blood pool imaging: can be used to observe the dynamic image of ventricular wall systole and diastole, for determining the ventricular wall movement and cardiac function has important reference value.