Infraorbital nerve originates in maxillary nerve which is the second branch of trigeminal nerve. It goes through inferior orbital fissure,then goes by inferior orbital groove and inferior orbital canal, at the end, it goes out of orbits at the inferior orbital foramen.Infraorbital nerve is highly vulnerable to damage in the fracture of orbital floor with the incidence of 85%. The clinical manifestations are featured by paresthesia of the middle of the ipsilateral lower eyelid, the nose skin and the upper lip skin and mucous membranes.The reasons can be analyzed: (1) optic nerve edema caused by trauma leads to the increasing internal pressure of inferior orbital canal；(2) the fracture line directly compresses the nerve.According to the therapy of the damage in inferior orbital nerve,there are conservative treatment and operative treatment. There is no final conclusion about which treatment is better.