The indications for coronary artery bypass grafting are mainly the following: 1, those who cannot be relieved by medication, or patients with frequent angina; 2, patients with coronary angiography, which confirms that the left main stem lesion has severe three-branch lesion, these patients will die suddenly at any time if they are not bypassed in time, so for patients who have two lesions with severe stenosis in important locations and cannot be treated by intervention, even if the angina is not obvious, but If the left heart function is not good and the ejection fraction is <50%, surgery should also be performed; 3. Patients who have failed interventional therapy, or patients who have stenosis again after coronary artery bypass; 4. Patients with heart rupture after myocardial infarction, pericardial filling, septal perforation or papillary muscle rupture, mitral valve closure insufficiency, these need emergency surgery, or surgery when the systemic condition is stable; 5. Patients with ventricular wall tumor formation, they can Removal of ventricular wall tumor, while doing coronary artery bypass, for patients with ventricular arrhythmias caused by old infarct scars, endocardial resection can be considered after cardiac electrophysiological examination; 6, patients with a relatively large area of old, also known as large infarction, are old without symptoms of angina, but left heart insufficiency, ejection fraction in <40% of patients should be operated, mainly depending on the survival of the myocardium; 7 In patients with unstable angina and variant angina, the three branches of the coronary artery have been clearly identified, and active medical treatment cannot relieve the symptoms, and the electrocardiogram shows ischemic changes and myocardial enzymatic changes, suggesting that myocardial ischemia has not been improved, such patients should also be operated; 8, diabetic patients, put stents on diabetic patients, the possibility of re-stenosis is quite large, and the introduction of drug stents, although it is The introduction of drug stents is able to solve some problems, but this part of the patients still need to do bypass surgery.