One year after gastric cancer surgery, patients are prone to diarrhea, usually due to vagus nerve severance and dumping syndrome, etc. Patients should make adjustments according to the specific causes and under the guidance of doctors. 1. Vagotomy: Gastrectomy and radical operation for gastric cancer will inevitably lead to severing of vagus nerve trunk, resulting in loss of parasympathetic innervation in digestive tract and intestinal dysfunction. Meanwhile, severing of hepatic and abdominal branches will lead to disorders of gallbladder emptying, increased secretion of bile salts, obstacles in digestion and absorption of fats, and episodes of diarrhea, so it is suggested that patients can adopt diet with high protein and medium fat. 2. Dumping syndrome: mostly appearing in gastric resection, gastric cancer after radical surgery, a large number of hypertonic coeliac into the duodenum and jejunum, causing increased intestinal luminal seepage, the patient appeared diarrhea, it is recommended that the patient eat less and more often, and the symptom is serious, can be improved by surgery. Patients with diarrhea symptoms should seek medical treatment in time and be examined and treated under doctor’s guidance so as not to delay the condition.