Facial paralysis caused by blowing air conditioner is caused by cold in the face, vascular spasm in the face leading to poor circulation, and damage to the facial nerve causing edema and demyelination. During the course of facial nerve travel, edema can occur after any segment is damaged by cold and other stimuli. Increased pressure in the nerve sheath accompanied by the restriction of the bony nerve tube will aggravate the obstruction of nerve blood supply, and ultimately produce facial nerve paralysis. Facial paralysis caused by air conditioning belongs to a kind of idiopathic facial nerve palsy, when the facial nerve is damaged, resulting in symptoms such as crooked mouth, facial stiffness, speech inconvenience. Idiopathic facial nerve palsy should be detected and treated early, so that the prognosis of the treatment is better, usually choose drugs such as dexamethasone and vitamin B12. After going to the hospital, the doctor will choose the appropriate program for treatment according to the cause of the disease, and the drugs need to follow the doctor’s instructions to apply reasonably.