When MVD treats HFS, HFS does not disappear immediately after surgery in some patients, but gradually disappears with the extension of time, this delayed healing phenomenon is called delayed healing after HFS surgery, in China, there are] reported that among 820 patients with HFS, there are 216 cases (25.8%) in which delayed healing occurred 10~160 days after MVD treats HFS surgery, and the average time of occurrence is Some scholars believe that the immediate healing after MVD surgery is due to the normalization of nerve conduction after the relief of the compression of the facial nerve demyelination zone by the responsible vessels, so that the short-circuiting phenomenon does not occur again and HFS disappears, but some patients with delayed healing are due to the long-term compression of the REZ zone by the vessels, resulting in demyelination of the facial nerve root and overexcitation of the facial nerve nucleus, although the compression of the facial nerve root by the vessels has been relieved. Although the compression of the facial nerve root has been released, it takes some time to recover from the reduced excitability and HFS still occurs after surgery, resulting in delayed healing in clinical practice. Some scholars have suggested that if no improvement in facial spasm symptoms is found 3 days after MVD surgery, the surgery is judged as ineffective and the preparation for a second surgery is recommended. Some experts and others believe that there is still HFS after surgery has no life impact on the patient, and early secondary surgery will not only increase the psychological burden and economic expenditure of the patient, but more importantly, due to the edema of brain tissue and nerves, it increases the risk of surgery and the chance of complications, and the necessity of early surgery is questionable in some patients due to the phenomenon of delayed healing, and it is recommended that secondary surgery should be performed at be performed 6 months or more after the first surgery when there are good reasons to determine that the surgery is judged to be ineffective, unless there is clear evidence of improper treatment of the responsible vessel during the surgery after the first surgery, then the second surgery can be performed early.