Heart bypass surgery usually takes the patient's own great saphenous vein and internal mammary artery, and establishes vascular channels in the coronary artery stenosis to improve hypoxia and ischemia, thus reducing the onset of myocardial ischemia in coronary heart disease. The completion of heart bypass surgery does not mean that coronary heart disease has been cured. Bypass surgery is a palliative method, which only temporarily solves some serious vascular stenosis, relieves myocardial ischemia, improves symptoms and reduces the risk of sudden death. But coronary heart disease still exists. If the risk factors of coronary heart disease are not effectively controlled, obesity, smoking, hyperlipidemia, hypertension, diabetes and so on. It will not only make its own coronary atherosclerosis continue to progress, but also make the bridging vessel, the internal mammary artery, atherosclerotic stenosis; Therefore, you must continue to take medicine after bypass surgery. If these risk factors are well controlled, the process of atherosclerosis will slow down; Coupled with good healthy living habits and optimistic psychological quality, it is possible for patients to survive for twenty or thirty years after bypass. On the other hand, if the risk factors are not well controlled, the survival time will be shortened.