A total of 98 ears(88 patients) of chronic otitis media(COM) under 15 years old were retrospectively analyzed. Among the 98 chronic suppurative otitis media, 55 ears(56%) were non-cholesteatomatous COM and 43 ears(44%) were cholesteatomatous COM(Cholesteatoma). The main presenting symptoms were the otorrhea(75%), hearing loss(18%), and otalgia. Sixty eight ears(69%) had small to total cental perforation and 18 ears of central perforation were the cholesteatoma. Fifteen ears(15%) had the attic or posterior marginal perforation and 14 ears of attic or marginal perforation were the cholesteatoma. The attic was the most common site of the cholesteatoma, and 40 ears(93%) out of 43 cholesteatoma involved attic. The aditus(65%) and the mesotympanum(53%) were the next common places for the cholesteatoma. Intact canal wall mastoidectomy(ICW) was the most common operative procedure and 69% of COM patients were operated with the ICW. In the cholesteatoma, open cavity mastoidectomy(OC) was the common procedure and 70% of cholesteatoma were operated with OC. The ossicular chains were intact in 73% in COM, however, only 14% were intact in the cholesteatoma. Eighty four patients were followed up through the outpatients clinic(OPD) and 47(55%) patients were completed postoperative dressing in 3 months and visited 11 times in average. The ICW and COM patients were visited OPD less frequently compare to the OC and cholesteatoma. Postoperative hearing was evaluated in 60 ears. Twenty four ears(40%) were improved hearing postoperatively more than 10 dB HL of air bone gap and 13 ears(22%) were aggravated 10 dB or more. In the OC procedure, 53% patients were improved hearing postoperatively, however, 34% of ICW patients were improved postoperative hearing. Preoperative Eustachian function test by Valsalva method was not significantly related with the postoperative improvement of hearing.