1.Radical radiotherapy Certain tumors sensitive to radiation can be cured by radiotherapy, which is called radical radiotherapy, such as malignant lymphoma, skin cancer, nasopharyngeal cancer, cervical cancer, tonsil cancer, vocal cord cancer and testicular seminoma, etc. Radiotherapy can be preferred. 2.Palliative radiotherapy aims to relieve symptoms and improve the quality of life. However, this treatment is often underestimated or misunderstood. In fact, palliative radiotherapy plays an important role in the overall treatment of tumor, such as for bone metastases, especially osteolytic ones, radiation therapy is very effective. For example, for bone metastases, especially osteolytic ones, radiation therapy is very effective. For lesions occurring in the long bones of limbs, radiation is more effective in relieving pain and can also prevent the occurrence of pathological fractures. For elevated intracranial pressure caused by brain metastases, the cranial nerve symptoms are significantly improved by radiation plus hormone therapy. For tumor compression and obstruction, such as esophageal obstruction of esophageal cancer, superior vena cava compression and spinal cord compression, radiation therapy can improve the obstruction and compression symptoms. Palliative radiotherapy can sometimes produce curative effect in the process of tumor treatment, and palliative radiotherapy and radical radiotherapy may sometimes be transformed into each other… 3.Preoperative radiotherapy refers to radiotherapy before the patient has surgery to improve the surgical resection rate, reduce local recurrence and improve the cure rate. 4.Intraoperative radiotherapy refers to radiotherapy in the middle of surgery, which is an effective measure to treat certain deep tumors. 5.Postoperative radiotherapy is an adjuvant treatment after surgery, which aims to eliminate the possible residual tumor tissues, prevent and reduce the possibility of recurrence, and control the lymph node metastases that cannot be removed or may be potential. 6.Heating radiotherapy refers to heating tumor tissues while radiotherapy to increase the therapeutic effect of radiotherapy. 7. Chemoradiotherapy refers to the use of small doses of chemotherapeutic drugs at the same time of radiotherapy to increase the sensitivity of tumor to radiotherapy and improve the therapeutic effect. Radiotherapy plays an important role in the treatment of cancer, and 60% to 70% of cancer patients need to receive radiotherapy. In terms of types of cancer, there are dozens of cancers that require radiation therapy, including malignant lesions that occur in multiple systems and organs from head to toe and from skin to internal organs. Radiation therapy is no less effective than surgery for some types of cancer. In other tumors, pre- or post-operative radiation therapy can significantly improve the outcome of simple surgery. For example, brain tumors that are difficult to remove during craniotomy can be controlled by radiation therapy; high-grade esophageal cancers that are difficult to operate on can be treated with radiation therapy; ventricular meningiomas that may spread throughout the brain and spinal cord cavity are surgically inaccessible, and chemotherapeutic agents have difficulty crossing the physiological barriers of the central nervous system, making radiation therapy a convenient and effective treatment of choice; and multicentric malignant tumors that occur throughout the body and in the lymphatic system or skin can be treated with radiation therapy. Malignant lymphoma of the lymphatic system or skin is mainly cured by the synergistic combination of radiotherapy and chemotherapy. Patients with late stage tumors may suffer from severe uninterrupted pain due to metastases, which can often be effectively curbed with one or several high doses of radiotherapy. Radiotherapy plays an important role in the clinical management of cancer and cannot be replaced by other treatment methods.