Whether patients can drink water after surgery when the anus is not ventilated should be objectively analyzed based on the specific situation of the patient’s primary disease: First, if the patient is due to acute simple cholecystitis, acute simple appendicitis line surgery to remove the gallbladder and appendix, the patient’s anus after surgery, although there is no ventilating can be a small amount of warm water, because the operation of gastrointestinal harassment of the gastrointestinal tract is lighter, the absorption of infection of the abdominal cavity is quicker, and a small amount of warm water will not aggravate the burden on the gastrointestinal tract or cause abdominal pain, abdominal distension symptoms. Small amount of warm water will not aggravate the burden on the gastrointestinal tract or cause abdominal pain and bloating symptoms. Second, if the patient due to colonic malignant tumor, gastric malignant tumor surgical resection tumor intestinal anastomosis, it is recommended that the patient’s anal defecation, defecation, and then eat warm water is more secure, to avoid premature drinking water caused by intra-abdominal intestinal dilatation, resulting in anastomotic fistula, which aggravates the patient’s condition.