Coronary angina needs to be diagnosed from symptoms, signs, and auxiliary examination as follows: 1. According to the patient’s symptomatic manifestations, under the triggering factors such as exertion, emotional excitement, cold, etc., pain in the precordial area behind the sternum can appear, sometimes radiating to the left arm and back, which can be relieved by taking nitroglycerin orally for 3-5 minutes; 2. Auxiliary examination, such as chest pain attack, electrocardiogram can find that the ST segments of the corresponding leads Auxiliary examination, such as chest pain attack, the electrocardiogram can be found that the ST segment of the corresponding lead is shifted downward more than 0.1mV, T-wave inversion, and the downward shifted ST segment of the electrocardiogram returns to normal after chest pain relief. Severe angina pectoris may present with abnormal markers of myocardial injury, and the most important method of confirming the diagnosis is coronary angiography. The discovery of cardiac vascular lesions stenosis, combined with the above clinical manifestations can be diagnosed as coronary angina pectoris.