Gastric diversion surgery is a type of weight loss surgery: a small pouch is made in the stomach, from which small intestinal tissue is connected, thus bypassing part of the stomach and small intestinal tissue. It serves to reduce the volume of the digestive tract and reduce absorption. Gastric diversion surgery is mainly applied to patients with obesity or type 2 diabetes with obesity, which can relieve diabetes to a certain extent. On the one hand, it can reduce the volume of the digestive tract and reduce the amount of food intake at each meal; on the other hand, it can reduce the absorption of food by the stomach and small intestine. Weight reduction is achieved from both aspects. Gastric diversion surgery generally has the advantages of small incision, good prognosis and generally not easy to recur, which can reduce serious complications such as diabetic nephropathy retinopathy. However, symptoms such as abdominal discomfort, inflammation of the anastomosis, gastroparesis, intestinal insufficiency and even inability to eat can occur. Whether to take gastric diversion surgery or not, it is best to follow the doctor’s requirements and recommendations.