Craniofacial injuries are mostly caused by direct violence, and a few are caused by indirect violence. Craniocerebral injury depends on the part of injury for skull, brain, cerebral nerve and vascular injury, which can exist alone or in combination. The initial CT examination after craniocerebral trauma can reveal direct signs such as skull fracture, cerebral contusion, intracranial hematoma; follow-up review can reveal signs such as trauma-induced brain atrophy, cerebral softening and hydrocephalus. CT primary examination can well show the changes of cranial density and morphological structure caused by the injury, not only can well show the skull fracture, but also can understand the intracranial injury, determine the presence of cerebral contusion and intracranial hematoma, which is recognized as the first choice for diagnosing cranial brain injury, and can also perform interventional treatment under CT guidance; however, for a few cranial brain injuries, such as diffuse axonal injury, especially non-hemorrhagic diffuse axonal However, CT is less sensitive than MRI for the diagnosis of a few cranial injuries, such as diffuse axonal injury, especially non-hemorrhagic diffuse axonal injury, and chronic subdural hematoma of equal density. If the initial CT examination is negative, we should pay attention to the changes in the condition and timely CT review or MRI examination.