The objectives in surgery of chronic otitis media are to eliminate the disease, restore hearing capacity, and possibly maintain normal anatomic contour. But there are so many problems in spite of numerous surgical procedures to achieve the above objectives. Therefore further research is needed. Authors reviewed 1,099 cases during the past six and half years from Jun. 1983 to Dec. 1989. As a consequence, following results were obtained. 1) There were little proportional differences between male and female, although age incidence was highest in the 4th decade(30.4%). 2) The most common state of drum was central perforation(38.5%). 3) Operative procendures were as follows : type 1 tympanoplasty 160 cases, ossiculoplasty 348 cases, intact canal wall mastoidectomy 408 cases, open cavity mastoidectomy 170 cases, modified radical mastoidectomy 12 cases, and radical mastoidectomy 1 case. 4) The most common hearing acuity was moderate hearing loss in degree(33.9%). 5) Gefilm sheeting(54.4%) was more used than silastic sheeting (14.9%). 6) The most commin state of ossicles was he cases with intact ossicles(55.6%), which was followed by the cases with eroded incus(15.4%). 7) The most common complication of mastoidectomy was wound infection(5.8%). 8) Postoperative hearing gain with ossiculoplasty was better in previous intact canal wall mastoidectomy cases(73.3%) than previous open cavity mastoidectomy cases(57.9%)(ABG<30dB). 9) The causes of ossiculoplasty failure were displacement, lateralization, and adhesion in order. 10) The success rate of drum graft was 88.0%.