Nasopharyngeal carcinoma (NPC) is a malignant tumor that occurs in nasopharyngeal mucosa epithelium. About 80% of NPCs occur in China, which seriously endanger people's health and life safety and NPCs are one of the malignant tumors that China focuses on prevention and treatment. Malnutrition has become a common clinical complication in NPC patients due to the disease itself and anti-tumor therapy. Among them, NPC patients receiving radiotherapy are one of the groups with the highest incidence of malnutrition. Malnutrition seriously affects the prognosis of NPC patients. Reasonable nutritional therapy has a positive impact on the quality of life and prognosis of patients with NPC. According to the patient's condition, choosing the best time and taking appropriate nutritional therapy play a key role to ensure the success of patients with radiotherapy and chemotherapy, and thus affect the patient's recovery and prognosis. It should be emphasized that no matter what nutritional treatment (enteral or parenteral nutrition) the patients should be evaluated first. The patient's nutritional status and energy needs should be formulated and adjusted according to the changes in weight and related indicators in order to improve patients' tolerance to radiotherapy and chemotherapy, to reduce adverse reactions, and to improve quality of life.