The fracture of the left parietal bone is very serious, mainly in the following aspects: 1, the fracture may lead to more obvious damage to the brain tissue, which may lead to respiratory and cardiac arrest, resulting in death. 2, may lead to epidural hematoma at the location of the parietal fracture, after the formation of the hematoma, with the increase of the hematoma may lead to the formation of brain herniation, which may lead to death. If the fracture of the left parietal bone is mild, it is possible to take conservative treatment measures or drainage to reduce the local hematoma and avoid excessive pressure on the brain tissue, which is relatively good for recovery. 4. The fracture of the parietal bone may lead to intracranial infection due to infection.