When patients receive radiotherapy, more or less will appear some radiotherapy reaction, such as oral mucosal reaction, loss of appetite, oropharyngeal pain, blood drop, etc. As these reactions will affect the patient’s appetite, resulting in aggravation of the reaction, the vicious circle will eventually affect the smooth progress of the treatment, or even interrupt the treatment, so the dietary management of radiotherapy patients is a very important issue. First of all, the patient’s diet should follow the principle of “three highs and one low”. The so-called three high that is, high vitamin, high protein, high calorie, such as lean meat, seafood, fresh fruits, vegetables, etc.; a low refers to low fat; secondly, the patient to eat light and easy to digest food, avoid greasy and spicy, try to do a good taste, so that the patient is easy to accept; thirdly: according to the reaction of radiotherapy in the food adjustment, such as the decline in white blood cells should be noted after eating some animal liver, spinach, Third: adjust the food according to the reaction in radiotherapy. If the patient suffers from loss of appetite and indigestion due to radiotherapy, a small number of meals can be given, and the food can be divided into several times under the premise that the total intake will not be reduced. It is not recommended to avoid food during radiotherapy.