The term “bypass” is short for coronary artery bypass grafting or coronary artery bypass surgery. The patient’s own blood vessels, such as the internal mammary artery, saphenous vein or radial artery, are used as “bridge” materials to create a new channel for the corresponding area of the blocked heart vessels to cross the stenosis of the coronary artery and anastomose with the distal vessels, so that blood rich in oxygen and nutrients from the aorta can bypass the stenosis and reach the distal vessels. This allows blood rich in oxygen and nutrients from the aorta to bypass the stenosis and reach the distal vessel, allowing the ischemic myocardium at the distal end of the stenosis to be resupplied with blood, thus solving the problem of myocardial ischemia. Bypass surgery has an “immediate” effect on the relief of angina. Depending on the patient’s preoperative condition, many patients are able to walk up and down stairs within a few days of coronary artery bypass surgery. If they recover well, they can go out on the street after a week. One to two months after surgery, they are able to perform light work. 3 to 4 months after the surgery, the patient basically recovers. Coronary artery bypass surgery is currently the most effective and reliable method of surgical treatment for coronary artery disease internationally, with a success rate of more than 99% in many large heart centers. It can effectively relieve patients’ angina, improve their mobility, improve their quality of life, and reduce the occurrence of myocardial infarction, malignant arrhythmia and sudden death, and prolong their life expectancy.