Particle radiation therapy for liver cancer is a relatively new type of liver cancer treatment. It has positive implications for the treatment of liver cancer patients. Particle radiation technology starts with loading the highly lethal radioactive particles into the implantation gun with forceps and pushing it in with a propeller, and then using CT guidance to put the puncture needle inside the tumor and ultrasound guidance to reach the desired location. After entering, the needle is taken out, then the sterilized particles are fixed on it, and then the particles are pushed into the tumor with a thruster, so that the radioactive particles implanted into the body are evenly distributed in three dimensions in the tumor body. The characteristics of particle radiation technology 1. is that it is very suitable for the shape of the tumor, no matter what the tumor looks like, what shape, we can distribute the particles very evenly and three-dimensionally in the whole tumor, and take the most appropriate implantation method according to different tumors, so that all the tumors can get the radical radiation dose that they should have. 2, is to protect the surrounding healthy tissues, when external irradiation, the radiation should pass through the skin, through certain normal tissues, and reach the tumor. The normal tissues other than the tumor are still partially irradiated. In this way, no matter how many rays are involved, some of the normal tissues will be damaged. Now we put the radiation source inside the tumor, it will not hurt the surrounding tissues. 3, the radiation source has a certain dose rate, the so-called dose rate, that is, how much radiation is emitted every hour, it is continuous, constantly stimulating the malignant tumor cells, so that, continuous stimulation, so that the cancer cells have no ability to fight back, and finally the cancer cells have to be destroyed by him. Before doing the treatment, we have to input the patient’s CT and MRI images into the computer, calculate a certain amount, and then determine how many particles need to be planted and the activity of each particle, and after that, send them in one by one. For example, brain tumors can be done, thyroid tumors in the neck, parotid tumors, lung and esophageal cancers in the chest, and liver cancers, and some recurring ones after surgery. In addition, after surgery, if there are residual tumors in the tumor bed or lymphoma area, or in the vicinity of large blood vessels or important organs, a planar implantation can be done, and the effect is also quite good. The side effects of the particle radiation technology like prostate cancer, there are three main side effects, one is the urethra, because it happens that the middle of the prostate is the urethra, if the particles are planted too close to the urethra, there will be urethral stricture, future urination difficulties, the sequelae are too serious, in addition, the back of the prostate is the rectum, close to the rectum, it is best to be a little farther away from the particles, to determine the amount of rectal dose received. The third is that you should not plant the particles on the pericardium, because there are nerves on the pericardium, and its nerves are governing the erection of the penis, and if you mistakenly plant them on the pericardium and damage the erectile nerves, the patient will be impotent and sexually dysfunctional in the future. This is why there are only four items. These four items will be used as evaluation criteria for particle implantation in prostate cancer.