At present, tumor treatment is mainly divided into three major treatment methods: surgery, radiotherapy and chemotherapy. Surgery has higher efficiency, but it is more physically demanding and dangerous for patients; radiation therapy is the use of radiation as a tool to kill tumors, which is characterized by no pain, no incision, less damage to patients, no physical exertion and higher overall efficiency; chemotherapy is a systemic treatment relying on drugs, and patients will have more serious reactions. Experts said that for tumor treatment, the choice of the first treatment is very important and requires full consideration and understanding of the type and development of the tumor, because tumor disease is quite complex. Not which single treatment means can solve the treatment of tumor, it must be based on the type of tumor, tumor site, tissue type, clinical stage of tumor, and patient’s physical condition; comprehensive consideration and reasonable combination of several treatment therapies. In the comprehensive treatment of tumor: radiotherapy is an effective and indispensable treatment tool to improve the local control rate of tumor. Especially with the rapid development of tumor radiation therapy technology in recent times. The role of radiation therapy in the field of tumor treatment has become more and more important. It has developed into a major indispensable treatment tool for tumor treatment. Radiation therapy can kill tumor accurately and effectively by applying radiation from advanced equipment without pain, like a scalpel, to cause necrosis, thus achieving a treatment effect similar to that of a scalpel, so the image is called a knife. Familiar to the majority of brain tumor patients in China first gamma knife, gamma knife is used to treat brain tumors, cerebrovascular malformations, epilepsy and other brain diseases and extracranial part of the tumor high-tech equipment, there are currently two types of gamma knife in China: namely, the Swedish Leksell gamma knife (201 beams of radiation) and domestic rotary gamma knife (30 beams of radiation). Gamma knife consists of 201 cobalt radiation sources arranged in a hemisphere, each source emits γ-rays are focused on the same point, that is, the site of the lesion, using gamma rays to kill the lesion. Gamma knife uses precise three-dimensional positioning technology, and one irradiation can complete the entire treatment process. With the widespread application of computers in tumor radiation therapy and the application of computer-controlled radiation generating equipment with high technological content, radiation therapy has entered a more high-precision development stage. In particular, tumor-adapted intensity-modulated radiation therapy can avoid the radiation from passing through the important organs around the tumor to the maximum extent, so that the functions of important organs can be fully protected, and at the same time, the tumor or tumor area can receive an effective tumor-lethal radiation dose, which improves the effect of tumor treatment. Intensity modulated radiation therapy is the best and most advanced treatment technology in the field of tumor radiation therapy at present. Compared with the ordinary three-dimensional conformal radiotherapy, intensity-modulated radiation therapy can form the ideal shape of dose distribution, increase the treatment dose in the target area, and achieve the purpose of eradicating the tumor as much as possible; reduce the radiation damage to the normal tissues around the target area, especially when the target area contains important organs, it can protect the function of important gas organs to the maximum extent; it can be multi-target area, and treat a large area at the same time. Intensity-modulated radiation therapy can integrate multiple target areas (large masses, subclinical lesions, lymphatic drainage areas) and multiple courses of field reduction treatment in one plan, and can give appropriate dose gradients, resulting in better treatment effects and fewer treatments.