1.Coronary angiography can clearly show the presence or absence of stenosis, the site, degree and extent of stenosis in the coronary arteries, which provides an important basis for doctors to rescue patients and develop further treatment plans. 2.Coronary angiography is performed by puncturing through the femoral artery of the thigh or the radial artery of the wrist, delivering a contrast catheter to the opening of the coronary artery, and visualizing the blood supply of the coronary artery by injecting contrast agent to show the blood flow in the coronary artery. 3.In the coronary arteries, if there is any narrowing of the blood vessels due to atherosclerosis formed by lipid deposition, it can be clearly shown by digital imaging of the X-ray machine. 4.Many patients with a history of chest pain have had their diagnosis of coronary artery disease clarified by imaging and have chosen the most reasonable treatment plan based on the imaging results, thus effectively avoiding the risk of sudden death caused by sudden heart attack.