Objective: To investigate the surgical techniques and speech performance of multichannel auditory brainstem implant ABI in patients with bilateral acoustic neuromas neurofibromatosis type 2. Methods The nucleus 21 channel auditory brainstem implant was implanted into the lateral recess of the foruth ventricle through the translabyrinthine approach in 7 patients after removal of the tumor. The accurate placement of electrode array was ensured by the electromyogram monitoring of the 7th and 9th nerves and the electrically evoked auditory brainstem responese EABR. Initial switch-on occurred six weeks postoperatively. Speech evaluation was performed every 3 months for the first year and annually thereafter. Results During the surgery the lateral reccess could be found and the typical EABR could in 6 cases. They later reported a significant benefit from the device. Two of the cases have achieved fuctional open-sel speech understanding. In contrast one patient with no EABR because of difficulty of the anatomic location during the surgery had no sensations postoperatively. Conclusion The multichannel ABIcould effectively restore auditory sensations in patients deafened by bilateral acoustic neuromas. The accurate location of the cochlear nucleus complex during surgery was the key factor for the success of the operation.