Vomiting yellow water after duodenectomy needs to be considered as a postoperative complication (pancreatic fistula, pancreatic duct obstruction, gastric emptying obstruction, biliary fistula), improper diet, cholecystitis, chronic gastritis and other conditions. 1. Postoperative complications: Duodenectomy is a relatively complicated surgery, and complications may occur after surgery, such as pancreatic fistula, pancreatic duct obstruction, gastric emptying obstruction, biliary fistula, etc. This is related to the surgery itself as well as the individual’s condition. This is related to the surgery itself and the individual situation. 2. Improper diet: after the operation, you need to strictly fast and abstain from food and water, and the specific time should follow the doctor’s instructions. Eating a liquid semi-fluid diet, and gradually transition to a normal diet. Diet should avoid stimulating food, regular eating. Improper diet may lead to vomiting of yellow water. 3. Cholecystitis: there can also be right back pain, anorexia and other symptoms, need to be combined with blood routine, abdominal ultrasound and other clear. 4. Chronic gastritis: there can be acid reflux, heartburn and other symptoms, need to be combined with gastroscopy, breath test and other clear. For the case of vomiting yellow water after duodenectomy, it is recommended to consult a doctor to analyze the specific causes.