According to the degree of injury, traumatic craniocerebral injuries can be classified into four categories: mild, moderate, severe and extra severe. Mild degree is often manifested as scalp injury without coma; moderate degree is manifested as cerebral contusion and skull fracture; severe degree is manifested as intracerebral hematoma, and extra severe will form brain hernia. 1. Mild: i.e. concussion. The duration of coma is less than half an hour, with only mild headache, dizziness and other symptoms of consciousness, and normal neurological and lumbar puncture examination. 2. Moderate: including cerebral contusion and skull fracture. The duration of coma after injury is usually less than 30 minutes. 3. Severe: There are epidural, subdural and intracerebral hematomas in the brain after the injury, and the duration of coma is usually more than 30 minutes. 4. Extremely severe: especially severe closed craniocerebral injury, brain hernia is formed after severe injury. Traumatic craniocerebral injury can be differentiated according to the degree of injury, but regardless of the degree of severity, it is necessary to seek timely medical treatment and standardized diagnosis and treatment under the guidance of professional physicians.