Coronary artery stenosis can be diagnosed by combining the following aspects: 1, clinical symptoms: typical angina pectoris, exertional angina pectoris, chest tightness and pain after activity, shortness of breath, dizziness, fatigue, etc.; 2, physical examination: heart enlargement, heart sound is low and dull, there is a murmur; 3, electrocardiogram: a commonly used means of diagnosis, attention should be paid to the results of the electrocardiogram with the absence of clinical symptoms to make comparisons; 4, ultrasound of the heart; 5, CT examination: i.e., cardiac blood vessels, CTA examination, the method is one of the major, intuitive means of examination; 6, coronary artery angiography: a major means of diagnosis, which is the gold standard of the coronary artery stenosis examination.