Patients with coronary heart disease are the main group of people for whom heart bypass surgery is indicated. Heart bypass surgery is a surgical procedure that allows blood to pass through the narrowed blood vessel to the ischemic area by creating another blood vessel proximal and distal to the narrowed area of the heart. Patients with coronary heart disease can usually improve the blood supply to the heart muscle and relieve angina and other uncomfortable symptoms after heart bypass surgery. Patients with general left main stem lesions, diffuse lesions in three vessels, and coronary artery disease complicated by acute myocardial infarction require heart bypass surgery.1. Left main stem lesions: Once the left main stem is blocked or restenosed, it can endanger the patient’s life, and treatment by medication takes longer and is less effective. At the same time, interventional intervention in this area is more risky surgically. Therefore, for patients with coronary artery disease with left main trunk lesions, heart bypass surgery can be considered as a treatment option, which can relatively reduce the risk of surgery; 2. Diffuse lesions in three vessels: If there are more vessels with lesions and interventional treatment is chosen, many stents may be placed, and the risk of secondary in-stent restenosis or in-stent thrombosis after treatment is relatively high. Therefore, for patients with diffuse lesions in three vessels, cardiac bypass surgery is first considered after physicians apply a specialized scoring scale for assessment, such as the SYNTAX score, with a score >36. In addition, patients with diffuse lesions of three vessels combined with diabetes mellitus, due to the effect of long-term elevated blood sugar on the blood vessels, will cause an increased probability of stent restenosis, should also consider coronary artery bypass surgery treatment; 3. Complicated acute myocardial infarction: patients with complications of acute myocardial infarction have ventricular septal perforation, mitral valve tendon rupture, or even heart rupture, this situation cannot be intervened by interventional means, and can only Consider heart bypass surgery treatment, and then combined with ventricular wall repair surgery and other comprehensive treatment.