What preoperative preparations do patients with coronary artery disease need to make if they need coronary artery bypass grafting? 1.Patients with smoking habits need to quit smoking and do some respiratory preparations (such as deep breathing exercises, nebulized inhalation therapy, etc.). 2.Patients with chronic diseases such as hypertension, diabetes and hyperlipidemia need to be controlled by medication. 3.If anti-platelet agglutination drugs such as aspirin or clopidogrel are being taken orally, the medication needs to be stopped and replaced by subcutaneous injection of low molecular heparin. 3-5 days before the procedure can be performed. 4.Perfect a series of laboratory tests and special examinations (such as ECG, cardiac ultrasound, chest X-ray, CT, vascular ultrasound, etc.). 5.Exclude nervousness, pay attention to the regularity of starting and living, rest is the main focus, moderate activity, and maintain nutrition. In fact, before the surgery, we will have someone to guide the preparation of the patient, and the next step is the surgery.