Cerebral hemorrhage in car accidents refers to bleeding from cerebral contusion caused by craniocerebral injury, or epidural hemorrhage, subdural hemorrhage and other conditions. The treatment of cerebral hemorrhage is decided according to the amount of bleeding, if the amount of bleeding is not big, less than 30ml in the cerebral hemisphere, less than 10ml in the cerebellar hemisphere, then generally take non-surgical conservative treatment, take hemostasis, dehydration, prevention of epilepsy, cerebral protection, acid suppression and other treatments. If the hemorrhage is large, the cerebral hemisphere is more than 30ml, cerebellar hemisphere is more than 10ml, then need to take craniotomy hematoma removal. If the patient’s pupil has been dilated before the operation, and the light reflex disappears when the brain hernia is formed, it is also necessary to carry out the decompression of the cranial bone flap to make the patient pass the dangerous period.