One CT radiation is mostly harmless to the patient’s organism, and in some patients, the radiation dose can be eliminated after 36 hours. The damage of CT examination to human body is mainly ionizing radiation of X-rays. The radiation dose of one general CT examination is small, and with the development of imaging technology, the radiation time and radiation dose of CT examination are obviously shortened, and the radiation damage to patients is also obviously reduced. Some patients are exposed to larger radiation doses for various reasons, or tumor patients undergoing radiation therapy are exposed for a relatively long time, and the damage to the body from ionizing radiation can disappear after 36 hours. The damage of CT examination to the organism is very low, and the patients who undergo the examination should have a correct understanding of this, but pregnant women who undergo CT examination have the possibility of teratogenicity and should try to choose other examination methods.