Abstract: Objective: To summarize the results of microsurgery with neuroendoscope in treatment of portio mollis acoustic neurilemoma.Methods: Eleven patents with portio mollis acoustic neurilemoma were treated alternately with neuroendoscope and surgical microscope(this part dissection under nerve endoscopy).The retrospective analysis and summerization were conducted.Results: In this group,the overall resection of tumors was carried out and all the facial nerve structures were complete.Four patients remained the listening ability.Neither death nor severe neuropathy occurred.Conclusions: The neuroendoscope used in the said part operation improves prominently the deep operational part illumination and identification of microscopic dissectional structure and plays an important assistant role in reduction of cerebel/brain stem traction,compensation of the deficits in surgical microscope and aid of microscopic surgery.