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 sounds low and dull, murmur; 3, electrocardiogram: commonly used as a 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: that is, the cardiac blood vessels of the CTA examination, the method of this method for one of the major, intuitive means of examination; 6, coronary artery angiography: as a major means of diagnosis, it is a coronary stenosis examination of the gold standard.