At present, the diagnosis of coronary artery disease is limited to clinical diagnosis only, which can no longer meet the needs of clinical diagnosis, treatment selection and prognosis of patients with coronary artery disease. Coronary angiography can evaluate coronary artery lesions from the perspective of pathology and pathophysiology, and is currently the best method for clinical diagnosis of coronary artery disease. In 1945, non-selective coronary angiography was first used to evaluate coronary artery lesions, but the clinical application of this method was greatly limited because the image was not clear, the amount of contrast agent was large, and multi-angle angiography could not be repeated. However, its peripheral vascular access is via brachial artery dissection, which requires the cooperation of surgeons and limits its wide application. The widespread use of true coronary angiography originated in 1967 when Judkins used the Seldinger technique to perform selective coronary angiography via femoral artery puncture, making this technique easy to perform, with a high success rate, few complications, practical and reliable, and repeatable. Based on this technique, surgical treatment of coronary artery disease and interventional treatment of coronary artery disease have created a new field of coronary artery disease treatment. Coronary angiography was first performed in China in 1973. The main purpose of coronary angiography is to evaluate the alignment, number and malformation of coronary vessels; to evaluate the presence, severity and extent of coronary lesions; to evaluate the functional changes of coronary arteries, including spasm of coronary arteries and the presence and absence of collateral circulation; and to take into account the evaluation of left heart function. On this basis, interventions can be performed according to the degree and extent of coronary artery lesions; the effects of coronary artery bypass grafting and interventions can be evaluated; and long-term follow-up and prognostic evaluation can be performed.