Radiotherapy is a common treatment method for cancer and is used in the treatment of many types of cancer. With the development of science and technology, radiotherapy methods are constantly being improved, and the therapeutic effect is getting better and better. Among the many radiotherapy methods, three-dimensional conformal intensity-modulated radiation therapy (3D CIMRT) is one of the most commonly used methods. Below is a brief introduction to 3D conformal intensity-modulated radiation therapy. The “Intensity Tuning”, i.e., Conformal Intensity Tuning Precision Radiotherapy System, is one of the most advanced equipments in the field of radiotherapy in the world at present. It means that the shape of the radiation field and the irradiation dose are consistent with the actual shape of the target area (tumor) in the three-dimensional spatial direction. Conformal intensity tuning maximizes the irradiation dose to the tumor and minimizes the irradiation volume and dose to the surrounding normal tissues and organs. Cancer cells themselves have the potential ability to accelerate proliferation, especially in the late stage of treatment by various therapeutic methods, after most of the cancer cells have been killed, the “doubling time” for the remaining cancer cells to proliferate into two can be shortened from the original 80 to 130 days to 4 to 6 days. This is one of the main reasons why it is difficult to cure cancer completely with radiation therapy, as the speed of killing cancer cells cannot catch up with the repair and regeneration of cancer cells. For the multiplication of cancer cell latency, researchers have improved the time-dose division scheme of radiation therapy by replacing one radiation treatment per day with two to three radiation treatments per day. The result was a reduction in the total treatment time or an increase in the dose within the otherwise prescribed total time. This treatment method, clinically known as “accelerated super-segmentation” and “super-segmentation”, has better effect on head and neck tumors, lung cancer, esophageal cancer, and certain tumors in the pelvis. For example, for esophageal cancer, the 5-year survival rate of conventional segmentation radiotherapy is less than 10%, but with super-segmentation radiotherapy, the 5-year survival rate is more than 30%. Advantages of three-dimensional conformal intensity-modulated radiotherapy 1. Wide range of indications for radiotherapy, reflective therapy can be considered for tumor patients who cannot tolerate surgery, chemotherapy and are in good general condition. 2. Certain therapeutic effect, no anesthesia, no incision, less pain, no infection, and fewer side effects. 3. As a non-traumatic treatment, radiotherapy can generally preserve the physiological functions of the patient’s organs. 4.Precise positioning: precise treatment; precise positioning; treatment guarantee. 5. Tumors of urinary and reproductive system: pelvic tumor, kidney cancer and including prostate cancer, etc. 6. Bone tumors : including osteosarcoma,, chondrosarcoma, fibrosarcoma and so on. At present, the development of medical technology is getting faster and faster, and the treatment effect is getting better and better, so cancer patients should not despair, and must actively accept treatment to prolong the survival period of patients and improve the quality of life.