In the rest and calm condition, sometimes it is not easy to detect the abnormality, so some auxiliary examination is needed. At present, the non-invasive examination methods that are more popular and commonly used in diagnosing coronary heart disease include: 1, electrocardiogram and electrocardiogram loading test (plate exercise test), which is the most commonly used method in diagnosing coronary heart disease. 2, dynamic electrocardiogram; 3, echocardiography; 4, radioisotope myocardial scanning. All of these non-invasive tests have some value in the diagnosis of coronary heart disease, and coronary angiography is the current gold index for the diagnosis of coronary heart disease.