Indications】 1. For tumors such as temporal bone, middle ear and parotid cancer, too much facial nerve is removed during resection, and it is difficult to use end-to-end anastomosis or nerve transplantation, anastomosis with the hypoglossal nerve can be performed immediately. If the primary facial palsy does not recover for a long time and there is severe neurodegeneration, but the muscles are still not atrophied. 3. Patients with long-term facial palsy who have failed to recover from nerve anastomosis or transplantation and who have been paralyzed for 2-3 years but have no obvious muscle atrophy on EMG can be tried. Because the activity of the sublingual nerve is better coordinated with the activity of the labial muscles of the facial muscles, it has better results than the paranasal nerve and phrenic nerve anastomosis. Preoperative preparation] Generally, the preparation is based on the resection of the primary tumor, and the hair around the ear and neck should be shaved and the skin should be cleaned before surgery if there is long-term facial paralysis. Anesthesia】 Generally, local anesthesia is used. If the primary tumor is removed during the operation, the anastomosis must be continued under general anesthesia. 1. 1-1.5 cm longitudinal incision is made in front of the ear screen, and a sigmoid incision is made along the earlobe backward from the lower edge of the mandible to the middle part of the mandible. 2.Separate the sternocleidomastoid muscle posteriorly, firstly find the facial nerve trunk at the cervical mammary foramen in front of the mastoid process, cut it off under the cervical mammary foramen, and turn the distal segment to the upper part of the parotid gland, the facial nerve has been cut in the tumor resection, so the distal segment should be preserved as much as possible. 3. Pull the sternocleidomastoid muscle posteriorly to find the carotid artery sheath, and pull the diastasis muscle upward to find the hypoglossal nerve running forward across the external carotid artery, and the downward branch of the hypoglossal nerve loop can be seen in front of the superficial layer of the internal carotid artery. 4. The distal segment of the hypoglossal nerve is cut deep under the mandible, keeping the longest possible segment of the nerve to anastomose with the distal segment of the facial nerve without tension. The distal segment of the hypoglossal nerve is cut with the proximal segment of the facial nerve and anastomosed with 9# nylon thread. In order to preserve the function of the hypoglossal nerve, the nerve may not be cut off, but under the descending branch of the hypoglossal nerve, the nerve diameter 1/2 is cut into a bevel, and the 5-cm long auricular nerve is bridged and one end is sutured into the hypoglossal nerve oblique incision, and one end is anastomosed with the proximal end of the facial nerve. Postoperative treatment】 1. Give broad-spectrum antibiotics to control infection after surgery. 2. Vitamin B1, B12 and other drugs to promote nerve metabolism can be given. 3. After 4-6 months, the function starts to recover, as shown by the ability to move the corners of the mouth, no water leakage, no food stuffing in the cheek, etc. The patient should be encouraged to do more coordinated movements of the face and tongue to avoid excessive linkage.