Patients who are ready for coronary angiography usually need to do the following three aspects of preoperative preparation: 1. These include routine blood tests, coagulation, liver and kidney function, electrolyte status and infection indicators. In addition, electrocardiogram, echocardiogram and chest X-ray should be performed. These examinations are usually done before or after admission to the hospital. 2.Pre-operative preparation. These include: local skin preparation, iodine allergy test, antibiotic skin test and marking the puncture artery; the above preoperative preparations are usually done 12 to 24 hours before surgery. In addition, the surgeon must get the consent form signed by the family to perform coronary angiography before the procedure, and explain in detail to the family the necessity and possible risks of the procedure, and answer the questions raised by the family and the patient. 3. Preparation of the patient. (1) Patients who undergo coronary angiography should preferably fast for 4 to 10 hours before the procedure. Usually, if the procedure is scheduled for the morning, breakfast is not eaten; if the procedure is scheduled for the afternoon, Chinese food is not eaten, but breakfast should be eaten. It should be noted that the issue of eating should be based on the schedule of the surgery, and the doctor in charge should be asked for details. (2) Ensure good rest and sleep. For mentally stressed patients, sedative medication may be used the night before the procedure. This is very important because poor rest can image the patient’s physical condition and increase intraoperative risk. (3) Patients who are ready to undergo imaging via the femoral artery should practice bedside bowel movements 1 to 2 days before the procedure. (4) Practice the movements that need to be coordinated during the procedure, mainly breathing and coughing. During coronary angiography, the patient is required to take a deep breath and then hold it. This action will make the image clearer. After each angiogram, the doctor will ask the patient to cough. This action will make the contrast agent drain from the coronary artery as soon as possible and increase safety. Each cycle of inhale → hold → cough is about 10 seconds. (5) Before the procedure (usually the doctor will tell the approximate start time of the procedure), it is best to go to the bathroom for a bowel movement and urination, as this will reduce inconvenience after the procedure.