Rectal cancer is the most common malignant tumor of digestive tract, and its continuous development will constantly consume the nutrition of human body, so it should focus on exogenous supplementation. Mainly, high protein food should be supplemented, including fresh beef, mutton, seafood and freshwater fish, which contain a large amount of protein and amino acid, which are very beneficial to patients with malignant tumors; seafood also has a certain amount of minerals, which is also conducive to the recovery of the disease. In addition, you should also supplement vitamin-rich foods, including fresh fruits, such as pineapple, oranges, oranges and so on. As for patients with late rectal malignant tumors, if they have difficulty eating, they can also be supplemented with fat milk and amino acids intravenously, or enteral nutrition, including supplemental anserine powder as well as elemental diets.