Radiotherapy has a very wide range of use, with the development of radiotherapy technology, its indications are more and more, about 70-80 tumors need to be treated with simple radiotherapy or combined with surgery and chemotherapy. Its indications include: head and neck tumor, thyroid cancer, nasopharyngeal cancer, maxillary sinus cancer, tongue cancer, laryngeal cancer, esophageal cancer, lung cancer, breast cancer, gastric cancer, cervical cancer, prostate cancer, rectal cancer, spermatogonial carcinoma, malignant lymphoma, soft tissue malignant tumors, etc. Radiotherapy is the first choice of treatment for nasopharyngeal carcinoma, Stage I Hodgkin’s disease, esophageal cancer of the cervical segment and the upper thoracic segment, prostate cancer, cervical carcinoma, etc., and can achieve very good treatment effect. It can achieve good therapeutic effect. In addition, certain benign diseases can also be treated with radiation therapy, such as keloid, erythrocytic lymphogranuloma, and axillary odor.