Radiation osteomyelitis triggering factors mainly include: 1, radiation dose, generally the larger the dose of radiation, the jawbone by the destruction of blood flow destruction, the greater the impact; 2, because the jawbone, once the radiation, the blood flow of their own destruction, their own repair and healing ability is very poor, once the extraction of the teeth, the wound is also very difficult to heal, the long term does not heal the decline in the ability to resist the infection can be secondary to osteomyelitis, from the local to all gradually occur osteomyelitis. Osteomyelitis occurs gradually from localization to all. If it is not treated effectively, it will continue to spread. Therefore, the predisposing factors are related to the dose of radiation, tooth extraction or small traumas in the oral cavity.