In the clinic, some patients in need of radiotherapy ask for “Intensity Modulation” or spend as little money as possible, but as a doctor, the first thing to consider is to fully satisfy the needs of the treatment, in order to achieve the best therapeutic effect. According to the development history of radiotherapy, radiotherapy methods mainly include: general radiotherapy (2DRT), three-dimensional conformal radiotherapy (3DRT), intensity-modulated radiotherapy (IMRT), respiratory gated radiotherapy, image-guided radiotherapy (IGRT), and computer-controlled precision radiotherapy. 1. General radiotherapy is the earliest radiotherapy method, which generally adopts square or rectangular single field or multiple fields for irradiation, and its irradiation range is large, so it has great damage to normal tissues and organs. Though there are new methods nowadays, it is still applicable to the treatment of some diseases, such as total cranial irradiation of brain metastatic carcinoma, and irradiation of bone metastatic carcinoma of the limbs, and its price is inexpensive and efficacy, which is no different from other radiotherapy methods. Guo Hongbin, Radiotherapy Department, Jilin Provincial People’s Hospital 2, three-dimensional conformal radiotherapy is the radiation field of different irradiation direction through artificial lead mold or multi-leaf grating to form a ray beam with the same shape with the tumor or irradiation site (target area), the normal tissues and organs are blocked from unwanted irradiation, so the damage is small, which is suitable for the treatment of all kinds of malignant tumors; however, the lead mold is more effective in blocking the normal tissues compared with the multi-leaf grating. 3.Three-dimensional conformal intensity-modulated radiotherapy (IMRT) is firstly three-dimensional conformal, but IMRT can make the target area produce higher dose, and at the same time make different parts of the target area produce different dose gradient, such as making the tumor area produce higher dose, the tumor periphery may not need the same dose as the tumor area, so that the irradiation of normal tissues is less. IMRT is especially suitable for the target area which is irregularly shaped and surrounded by important tissues and organs, such as nasopharyngeal carcinoma. IMRT is especially suitable for the irregular shape of the target area and the surrounding important tissues and organs, such as nasopharyngeal cancer. 4.Breathing gated and image-guided radiotherapy is mainly used in the treatment of lung tumors, the position of the target area is not completely fixed, and the position changes with the breathing and organ movement, and the irradiation field always follows the target area through special technology, which avoids unnecessary damage to normal tissues. 5.Computer-controlled precision radiotherapy, such as radio wave knife, is a computer-controlled image-guided radiotherapy, which is suitable for tumors located in important parts and the position of target area is easy to change with the movement of organs, such as lung cancer and intracranial tumor. According to the working experience, the above radiotherapy methods are in increasing order of the national charges: intracranial metastatic cancer, bone metastatic cancer, general radiotherapy; smaller tumors, intracranial primary tumors, esophageal cancer, rectal cancer, three-dimensional conformal radiotherapy, and postoperative three-dimensional conformal radiotherapy for breast cancer; nasopharyngeal cancer, lung cancer, esophageal cancer, rectal cancer, pancreatic cancer, and other abdominal and pelvic malignant tumors, intensity-modulated radiotherapy; and important parts such as brain stem, paravalvular, posterior eyeballs, and other important parts of the brain. , paravalvular optic nerve, retrobulbar, liver, kidney and other parts of the tumor choose precision radiotherapy. The final principle of choosing radiotherapy is: the higher the dose inside the tumor, the better; the lower the dose to normal tissues and organs, the better; after weighing the two, the better.