Angina pectoris is determined by the patient’s symptoms, electrocardiogram and coronary angiogram. Angina pectoris is caused by inflammation and ischemia of the coronary arteries, and most of them develop after exertion. To determine angina pectoris, it is necessary to know the patient’s age, the triggers of the onset of the disease, the nature of the patient’s pain, and the methods of relieving the pain, etc. Most of the patients can be basically sure of the angina pectoris through the symptoms. Patients suspected of angina pectoris should undergo electrocardiogram (ECG) examination in a timely manner, and some patients will have ST-segment changes in ECG at the onset of the disease, which can provide a basis for clinical diagnosis. Coronary angiography is the gold standard for the diagnosis of coronary artery disease, which can show the coronary arteries very clearly, can clarify the degree of coronary artery stenosis, and make a clear judgment on coronary artery disease. Patients with chest pain should go to the hospital in a timely manner, under the guidance of the physician, the patient’s symptoms, and guide the patient to improve the relevant examination, a clear diagnosis of angina pectoris.