The classification of skull base fractures mainly includes the following aspects: First, fractures of the anterior skull fossa, mainly involving the orbital roof and sieve, patients may have rhinorrhea, extensive periorbital petechial hemorrhage, i.e., panda eye sign, and extensive subconjunctival petechial hemorrhage. If the meninges and periosteum are involved, it is easy to combine with cerebrospinal fluid nasal leakage, and it can also damage the optic nerve and olfactory nerve. Second, if the fracture of the middle fossa of the skull involves the pterygoid bone, there can be nasal bleeding combined with cerebrospinal fluid nasal leakage, and if the rocky part of the temporal bone, meninges and periosteum are involved, cerebrospinal fluid ear leakage is likely to occur. Thirdly, posterior cranial fossa fracture can involve the posterior lateral part of the temporal bone rock, and most of the subcutaneous ecchymosis in the mastoid region appears 1-2 days after the injury, and if the base of occipital bone is involved, swelling and subcutaneous ecchymosis in the lower occipital region can appear several hours after the injury, and it can also combine with posterior group cranial nerve injury. The diagnosis and localization of skull base fractures are mainly determined by the above clinical manifestations. The delayed onset of petechiae, the specific location and the fact that they are not the direct point of action of the violence can distinguish them from simple soft tissue contusions.