Lymphoma often requires radiotherapy about 25~30 times. Lymphoma is a relatively common malignant tumor in clinic, and radiotherapy is an important means of lymphoma treatment, especially for early stage lymphoma, in addition to chemotherapy, targeted therapy, etc., the use of local radiotherapy can further improve the prognosis of the patients, and even be able to achieve a cure. Radiotherapy should be carried out according to the course of treatment to achieve the therapeutic effect of slowly killing tumor cells. In recent years, the level of radiotherapy has been improved, and the complications of radiotherapy have been significantly reduced compared with the previous one, and the safety is relatively high, but attention should be paid to the evaluation on time to avoid serious adverse reactions. Therefore, lymphoma should be treated with radiotherapy according to the cycle, and pay attention to the adverse reactions.