There are presented results of 87 tympanoplasties performed in the Department of Otolaryngology Medical Academy in Białystok from 1997 to 1998. In 35 (40.02%) of treated ears there were cholesteatoma, granulation or (and) polyps. Tympanosclerosis, diffuse synechiae and mucosal discharge (non-reacting to pharmacotherapy) were also encountered during surgery. 65 (74.8%) of patients were operated on by closed methods including reconstruction of tympanic membrane, ossicular chain, posterior and superior wall of external canal using autologous tissue such as temporalis fascia, adipose tissue, cartilage, perichondrium or bone. In operations using open methods, post-operative cavities were reduced using musculo-fascial transplants or bone to decrease the space of the antrum and mastoid process. Tympanic membrane and ossicular chain were repaired at the same time. Drainage of post-operative cavities was performed in some cases which lasted 3-8 weeks. Anatomical and functional results of surgery were good in 62 (71.2%) of cases. The pathologic condition in the middle ear had a significant influence on the post-operative results. Unsuccessful results of tympanoplasty were due to recurrences of cholesteatoma, adhesion, diffuse tympanosclerosis, infection and secretory middle ear mucosa.