The purpose of nutritional fluids is to give the patient increased nutrition. If the patient is malnourished, he or she will lose weight dramatically. At the time of surgery, or after the surgery, complications can easily occur, such as the development of pleural effusion, peritoneal effusion, hypoproteinemia, anastomotic fistula, and residual abdominal infection. Nutrition fluids, divided into parenteral and enteral nutrition fluids. Parenteral nutrition fluid is what is used in the vein, including glucose, fatty milk and amino acids, which are usually mixed together, and also includes electrolytes, prepared in a three-liter bag and fed in the patient’s vein. Enteral nutrition solution includes Bepril, Energizer, Ensure, etc. It is mainly soy, as well as fat and protein mixed together, and is slowly dripped into the jejunum through the patient’s oral or enteral nutrition tube for absorption and use.