Coronary heart disease is a common cardiovascular disease. When a patient is suspected of having coronary heart disease, he or she should go to the hospital and ask the doctor for consultation and treatment in a timely manner. In addition to asking patients about their symptoms and conducting physical examinations, doctors should also arrange some auxiliary examinations. With the development of science and technology, there are more and more methods and instruments used to diagnose coronary heart disease. At present, there are many methods to diagnose coronary heart disease, including non-invasive and invasive tests. Non-invasive tests are usually performed first, and then invasive tests are arranged according to the situation. Common tests are arranged first in non-invasive tests, and then special tests are arranged. Basic tests for the diagnosis of coronary artery disease include electrocardiogram (including resting electrocardiogram, ambulatory electrocardiogram, exercise electrocardiogram, etc.), echocardiogram, X-ray and hematological tests. Special tests include radionuclide myocardial imaging, multilayer spiral CT imaging, cardiac MRI, coronary angiography, etc. Among all the methods to diagnose coronary artery disease, coronary angiography is the most reliable method and the main means to diagnose coronary artery disease, and it is the gold standard for coronary artery disease diagnosis.