Background: Otosclerosis is one of the most common cause of progressive hearing loss in young adults. Otosclerosis is a primary disease of the otic capsule and middle ear ossicles just anterior to stapes footplate which is more specifically. Aim of the work: This study was to evaluate the success rates of stapedectomy with preservation of stapes suprastructure with stapedial muscle tendon compared to stapedectomy without preservation of stapedical muscle tendon in the operative management of otosclerossis. Patients & Methods: This study was conducted in Otorhinolaryngology Department, Faculty of Medicine, Zagazig University during the period from October 2018 to July 2019 on 18 patients with conductive hearing loss. Arranged into two groups, group I with preservation of stapedial tendon and group II with cut of stapedial tendon. Number of each group is 9 patients. Results: There is statistically insignificant difference between two groups as; regard pre and post-operative air conduction, bone conduction, air bone gap. The difference was statistically significant. There was statistically significant difference regarding air conduction of pre and postoperative group I and group II at all frequencies while it was insignificant at 8 KHz . There is statistically significant difference of air bone gap. Conclusions: Preservation of the stapedial tendon in the surgical treatment of otosclerosis is associated with improvement in functional outcomes, as well as provides the patient with stapedial reflex that had primary protective effect against strong acoustic stimuli