(1) Stable angina is ineffective by medical treatment, obviously affects labor and life ability or is confirmed to be a proximal lesion of the left main trunk or multiple vessels by imaging. (2) Unstable angina is not treated by internal medicine. (3) Variable angina with moderate to severe coronary artery obstructive lesions, drug treatment, ineffective. (4) Post-infarction angina: coronary angiography is performed at the same time as medical treatment, if it is confirmed that there is significant stenosis or obstruction in the main trunk or major branches of the coronary arteries. (2) Indications for surgery of coronary lesions (1) Stenosis and obstruction of the left main trunk >50%. (2) Left anterior descending branch near high stenosis obstruction > 50%, not suitable for percutaneous transluminal coronary angioplasty (PTCA). (3) Three or more branches with obvious symptoms. 3.Acute infarction: Emergency “bypass” within 6 hours after the infarction. If the infarction has exceeded 6 hours, the surgery should be performed after 1 month of medical treatment. 4.Complications after acute infarction (1) left ventricular wall tumor (2) septal perforation (3) papillary muscle rupture (4) left ventricular rupture (5) post-infarction cardiogenic shock should be operated urgently if it cannot be controlled by medical treatment. 5.If there is no symptom of occult coronary artery disease, but myocardial ischemia is found in electrocardiogram, coronary angiography should be performed, and if it is determined that there are obvious narrowing lesions in the main trunk or multiple major branches of coronary arteries, surgery should also be performed to prevent heart attack or sudden death.