Radiotherapy is effective in the mediastinum if there is lymph node enlargement caused by tumor, which can significantly reduce the symptoms and thus control the growth of the tumor. Radiotherapy for mediastinal lymph node enlargement is effective, especially for superior vena cava syndrome caused by mediastinal tumors, as well as dysphagia and mediastinal lymph node enlargement caused by esophageal obstruction, the effect is especially obvious after radiotherapy. Stereotactic radiotherapy can be performed for mediastinal tumors, which can significantly reduce the pain and symptoms, and thus achieve the purpose of controlling tumor growth. Most of the mediastinal lymph node swelling is caused by lung cancer metastasis, lymphoma and thymoma, etc. Radiotherapy has good effect. In addition, of course, under the guidance of doctors, chemotherapy can be carried out on the basis of radiotherapy in the primary disease to increase the control effect of radiotherapy.