With the rapid development of radiotherapy technology, the effect of radiation therapy is getting better and better, especially the clinical application of new technology of intensity-modulated conformal radiation therapy, which has brought gospel to tumor patients. The principle of radiotherapy treatment is to kill cancer cells by radiation. Theoretically, the higher the radiation dose, the more completely cancer cells are eliminated. However, since tumor cells grow in normal tissues and their shapes are very irregular, the radiotherapy must be expanded in order not to miss the cancer cells in the past, but this surely has many normal tissues also being unnecessarily irradiated, with the consequence of increasing the side effects of radiotherapy. Moreover, due to the increased side effects, the dose (intensity) of radiotherapy cannot be further increased, and there are many tumors that cannot achieve radical cure. As a means of local treatment, the ideal radiotherapy is to maximize the killing of tumor cells while maximizing the protection of surrounding normal tissues and organs, i.e., to maximize the therapeutic gain ratio of radiotherapy. Is there a way to make tumor treatment as precise as sculpting? The answer is to apply the radiation dose like sculpture. A three-dimensional dose of radiation is sculpted to match the shape of the tumor in three dimensions and to ensure that the dose within the three-dimensional shape is high enough to kill the tumor cells and protect the surrounding normal tissues from damage. In layman’s terms, Intensity Modulated Conformal Radiation Therapy (IMRT) is like using a precisely sculpted three-dimensional dose of radiation to construct the outer contour of a dose that is consistent with the tumor in all aspects of life, encasing the tumor cells and delivering a devastating blow to them without causing much damage to the normal tissues of the body. Therefore, it is called a revolution in the history of radiation oncology. Intensity Modulated Conformal Radiation Therapy is applicable to neurological tumors, head and neck tumors, thoracic and abdominal tumors, urological and genital tumors, bone tumors and other diseases. The whole treatment is like a precision-guided missile that delivers a devastating blow at the tumor site. The intensity-modulated radiation therapy is very elaborate: through the intensity-modulated radiation therapy procedure, tumor cells are killed more effectively and accurately: first, a plastic model is tailor-made for the patient to fix the treatment site, so that the tumor site is in a relatively static position during the radiation therapy. The CT scan is sent to the computer and the physician determines the location and extent of the tumor, i.e., the target of intensity-modulated radiation therapy; the tissues and organs to be protected, such as the spinal cord, parotid gland, eyes, lung tissue, liver, kidney, intestines, etc., are identified. From the top of the head to the lower edge of the clavicle is about 150 layers long, and the physician needs to outline the shape on the 2.5 mm thick CT tomogram one by one. Meanwhile, the effect of intensity-modulated conformal radiation therapy is quite obvious. Take the intensity-modulated conformal radiation therapy for nasopharyngeal cancer or head and neck cancer as an example, in addition to the dose achieving the purpose of making the tumor radical, the intensity-modulated conformal radiation therapy can also protect the function of parotid gland compared with the traditional treatment. The Oncology Radiotherapy Center of the Second Artillery General Hospital has now become the largest, most well-equipped and technically strongest oncology treatment center in Beijing. Since 2007, the oncology department of the hospital has carried out intensity-modulated conformal radiation therapy, which has significantly improved the efficacy and survival quality of patients.