The symptoms of facial palsy include loss of frontal wrinkles, enlarged eye fissures, flattened nasolabial folds, drooping corners of the mouth, and skewed corners of the mouth to the key side when the teeth are exposed. When eating, food residues are often retained in the gap between the teeth and cheeks on the sick side, and saliva often flows down from that side. The clinical examination should be carried out and compared from two states of expression movement, static and motion, and for patients with facial palsy, the examination should follow the principle of zoning and combination of motion and static. Usually the expression functional area of the maxillofacial region is divided according to different facial nerve branch innervation areas, into frontal, periorbital, mid-facial, periorbital and mandibular and cervical regions. The clinical examination should be performed in a gradual manner, from top to bottom, from the center to the periphery, one by one. 1.Dynamic examination: asymmetry of bilateral expression movements during expression movement, sluggish or rigid expression on the affected side without expression. 2.Static examination: asymmetry of facial expressions on both sides in static state, and in severe cases, the whole face is skewed and rigid.