In principle, post-operative chemotherapy diet for gastric cancer is based on light diet, which should be nutritious and easy to digest and absorb. Because of the stimulation of drugs on gastrointestinal tract after chemotherapy patients can show symptoms of nausea, vomiting and loss of appetite, so the diet should pay attention to the following points: First, light diet, such as porridge, noodles, vegetarian buns, lump soup and other foods that can be easily digested and absorbed, avoid greasy foods that can reduce patients’ appetite and stimulate patients to appear discomfort. Second, the diet should be diversified to strengthen the appetite, such as stir-fried small oily vegetables, cold fungus, cucumber, small tomatoes, apples, kiwi, grapes. In addition to chemotherapy, some patients have very large gastrointestinal reactions after chemotherapy, so if they cannot eat, they should be given intravenous energy supplements in time, as well as medication to protect the gastric mucosa, acid suppression and antiemetic treatment to relieve patients’ discomfort. After chemotherapy, in addition to diet, we need to review the blood test, liver function, kidney function and other indicators on time, and deal with any abnormalities in time. Avoid going to places with high flow of people to prevent infection.