Many parents of children ask what can our children eat after the disease and what are the contraindications. Indeed, energy and nutrient intake is an important guarantee for children to complete tumor treatment. Children suffering from hematological diseases and tumors have poor nutritional status due to tumor consumption, loss of appetite, chemotherapeutic drug effects, or decreased intestinal function, etc. The poor nutritional status makes the body resistance worse, and it is simply difficult to withstand the subsequent chemotherapy. We have a child with lymphoma, because of intestinal infection after chemotherapy, complicated by intestinal obstruction, intestinal perforation and intestinal fistula, for a period of time can’t take in food by mouth, weight loss rapidly, thin as skin and bones, even if the chemotherapy drugs are reduced in dosage, or after chemotherapy, serious infections still occur. The surgeon then found a way to operate on her, removing the diseased intestinal segment and making a fistula opening on the surface of the body, which provided time for intestinal repair. Together with nutritional support, her weight rapidly returned to the state before the onset of the disease, and she finally completed the subsequent chemotherapy. This example shows the importance of nutrition for children with tumors, so what kind of nutrition do children with tumors need? Weekday diets should preferably be home-made, clean and hygienic, as well as suitable for the accustomed tastes of the children, preferably high-quality, high-protein foods, and at the same time should be combined with meat and vegetables to ensure the intake of fiber and keep the stools smooth. It is not recommended to eat alternate meals. In special treatment stages, there are some special food precautions: In the treatment of leukemia or lymphoma, L-mentholase (referred to as menthol) may be used, low-fat diet is needed during the use of menthol chemotherapy, in order to reduce the probability of menthol-associated pancreatitis, but it is also necessary to ensure that the intake of protein, fish, shrimp is a good choice, and sometimes the doctor may also recommend the use of some whole nutrient formulas Preparations. Some chemotherapy drugs have a great impact on the gastrointestinal tract, and even nausea and vomiting after chemotherapy is finished and discharged from the hospital. Parents should not force their children to eat at this time, but rather follow the instructions, start with a liquid diet, eat small amounts of food, and gradually resume eating. When mouth ulcers appear after chemotherapy, avoid rough and hard food, but when supplementing B vitamins, zinc supplementation, to promote mucosal repair. Bone marrow suppression period after chemotherapy, especially when neutrophils are reduced or lacking, resistance is very poor, all imported food must be cooked at high temperatures to kill germs, and raw fruits are not recommended. When mouth ulcers appear after chemotherapy, the food should be mainly fluid, avoid rough and hard food, but when supplementing B vitamins, zinc supplementation, to promote mucosal repair. Western medicine does not pay attention to the taboo, nutritious, hygienic and tasty meals can be, I hope that our children can be in good nutritional state, through the test of disease and treatment!