A total three-hundred-seventy-one operated cases of chronic otitis media by one otologist were retrospectively analyzed. Two-hundred-forty-six patients were followed up one to 8 year and plus months. Among 371 patients, one-hundred-twenty-five (37%) were cholesteatomatous chronic otitis media (CHOLE) and thirty-two patients (8.6%) were revision operation (REV). Most common age group was 20ths (45%) and the major presenting symptoms were hearing loss and otorrhea. Most common preoperative complication was labyrinthine fistula and comprised 9% (11 patients) among the 125 CHOLE patients. Incus destruction was the most frequent and 17% in non-cholesteatomatous chronic otitis media (COM) and eighty-five percent in CHOLE were found partial or total destruction of the incus. Almost all COM patients were operated with intact canal wall mastoidectomy (ICW) and 58 percent of CHOLE patients were operated with ICW. In terms of diagnosis of the CHOLE, about 10% of patients were changed diagnosis postoperatively. Postoperative air-bone gaps were improved 13dB in type I tympanoplasty, 10dB in malleus stapes assembly, 12dB in type III tympanoplasty, and 10dB in columellization, respectively. Among two-hundred-forty-six long-term followed up patients, forty-three% of COM and twenty-one% of CHOLE, and 15% of REV patients were improved hearing, less than 15dB air-bone gap, without evidence of recurrence of infection. In the long-term follow up of this study revealed that the operation failure rate was 14% in COM, 17% in CHOLE, and 31% in REV.