After coronary artery bypass grafting, the blood supply to the heart is well improved. The most important treatment after surgery is to participate in cardiac rehabilitation program, regular review, control the risk factors of coronary heart disease, and learn good lifestyle and diet to maintain coronary artery patency, improve and enhance heart function, and reduce the recurrence of coronary restenosis. Postoperative diet is a correctable risk factor, therefore, patients after coronary artery bypass grafting should pay attention to the diet. 1, pay attention to the supplement of high quality protein to ensure 1 egg, 50g of lean meat, 50g of fish and appropriate amount of soybean products per day. 2, low-fat diet diet should limit the intake of animal fat, cooking, more vegetable oil, cholesterol is limited to less than 300 mg per day. Lower fat food preferred soybean products. Black fungus has the effect of anti-platelet coagulation, lowering blood lipids and stopping blood cholesterol deposition. Capsicum, oats and barley are good for lowering blood lipids, lowering blood cholesterol and reversing fatty liver. High blood lipids cause patients’ blood to be sticky, form arterial plaques and cause atherosclerosis, so the intake of fat and cholesterol should be strictly controlled. Try not to use fatty meat, animal oil, chocolate and other foods, and use vegetable oil. Eat more fish, which contains unsaturated fatty acids and has the effect of preventing atherosclerosis. In addition, snapper, garlic, kelp, fresh milk, red pepper can lower cholesterol, while animal offal, brain, egg yolk, fish roe, etc. should be consumed less, its cholesterol content is high. 3, vitamins and fiber fruits and vegetables are rich in vitamins, potassium, magnesium, these substances can maintain the nutrition of the heart muscle and lipid metabolism, vitamins can reduce the absorption of cholesterol in the intestine, is conducive to the prevention of coronary heart disease, can also prevent and cure constipation. The main sources of food fiber are coarse grains, celery, bean sprouts, strawberries, pineapple, rice bran, etc. 4, low sodium diet low sodium diet should eat less salt or smoked foods; canned foods are eaten sparingly. 5, other diets should be a small number of meals, avoid overfull, do not drink strong tea, coffee containing drinks. Avoid flatulent food such as raw radish, dry beans, so as not to affect the heart activity with intestinal flatulence. In terms of alcohol consumption, a small amount of alcohol can appropriately increase blood circulation, which is conducive to the smooth flow of bridge vessels, and those who do not drink alcohol before surgery may not need to drink alcohol.6. Avoid foods that excite the nervous system, such as wine, strong tea, coffee, etc. Smoking is extremely harmful to the heart because: (1) cigarettes contain tar, nicotine and carbon monoxide, which are extremely harmful to the human body. (2) When the concentration of carbon monoxide hemoglobin in the blood is too high, the blood oxygen concentration can be reduced, tissue oxygen supply is insufficient, the inner wall of the artery edema, endothelial damage, lipid infiltration into the vessel wall, accelerating the formation of atherosclerosis. (3) patients with coronary heart disease, smoking can accelerate its progress and cause heart attacks. Heavy smoking can induce ventricular fibrillation and other serious arrhythmias, and become one of the causes of sudden death.