Esophageal ESD refers to endoscopic mucosal dissection, and the precautions on the day before the surgery include preoperative examination, gastrointestinal preparation, and discontinuation of medication. 1. Preoperative examination: routine blood test, blood biochemistry, coagulation function, electrocardiogram and echocardiogram, mainly to observe the patient’s nutritional status, water-electrolyte status, the presence of coagulation dysfunction and cardiac conditions. 2. Gastrointestinal preparation: 2 days before the esophageal ESD surgery, the patient needs to have a light diet and eat liquid food, and fasting and water fasting before anesthesia. 3. Discontinue medication: The main purpose is to stop taking medications that can affect blood clotting, such as aspirin, warfarin, and low molecular heparin. The day before the esophageal ESD surgery, you must consult your doctor and make good preoperative preparations.