Gastric diversion surgery generally has no serious complications, and common sequelae include gastroparesis syndrome, affecting gastroscopy, anastomotic ulceration, anastomotic stenosis, electrolyte disorders, and slightly poor absorption of some special nutrients. 1. Postoperative sequelae mainly include gastroparesis syndrome, which is manifested by gastrointestinal emptying disorder, nausea and vomiting. 2. Gastroscopy is slightly affected after gastric diversion, and it is not easy to observe comprehensively. 3. After gastric diversion surgery, the gastric acid secretion is disturbed, which will easily lead to ulcers at the anastomosis. 4. There will be tissue proliferation at the healing place of incision after surgery, which will easily cause anastomotic narrowing. 5. Postoperative nausea and vomiting as well as absorption disorders can cause electrolyte disorders in the body. 6. After gastric diversion surgery, there will be some absorption disorder, and the absorption of some special vitamins or nutrients will be slightly poor, so it is necessary to supplement the appropriate vitamins in daily life in a timely manner. Gastric diversion surgery used to be used for patients who cannot eat in the advanced stage of gastric cancer, but now it can be used for treating type 2 diabetes mellitus to make the blood sugar return to normal, with better effect, which needs to be operated by professional doctors.