With the new technology of “3D Intensity Modulated Conformal Radiotherapy”, about 70%-75% of all tumors should be treated by radiotherapy alone or in combination with other methods. However, the previous clinical experience of radiotherapy proves that, because the tumor form is irregular and the radiation output of the machine is uniform, the radiation treatment of tumor also causes radiation damage to the normal tissues around the tumor – in most cases, while improving the local control rate of tumor, it is bound to cause more damage to the normal tissues. Three-dimensional intensity modulation conformal radiotherapy system applies advanced computer technology to imaging. The so-called intensity modulation means that the machine outputs uneven rays — so that the high dose distribution is consistent with the irregular shape of the main body of the tumor, which realizes the optimization and individualization of the treatment plan and the stereotactic radiotherapy of radiation. Its greatest advantage is that the dose of radiation is concentrated to the lesion area, which allows the tumor to receive a much higher dose than conventional radiotherapy, and the surrounding normal tissues are protected by a significant reduction in irradiation dose. At the same time, the increased dose of each radiotherapy treatment can reduce the number of radiotherapy treatments and shorten the period of patients receiving tumor treatment. “3D Intensity Modulated Conformal Radiotherapy” is mainly used to treat a variety of tumors such as head and neck tumors, brain tumors,, prostate cancer, and and