Neutron therapy for tumors is defined as a treatment method that kills tumor cells through targeted neutron rays. Neutron therapy is through the directional input of a compound containing boron into the human body, due to the boron element and tumor cells have great affinity, so it will be directed to enter the tumor cells, and in the human body of the normal human body tissues in the content of the relatively small. At this time, the human body is irradiated by external rays. This kind of ray will not cause much damage to the normal tissues of the human body, but it will have strong nuclear reaction with the boron element in the cancer cells, releasing a strong killing ray, but the range of this kind of ray will not be more than the length of a cancer cell, so the damage will be concentrated in the cancer cells, which will not cause any obvious damage to the normal cells of the human body.