This report was attemped to analyze 55 cases of fiberoptic bronchoscopy during the period of 3 years from Feb. 1978 till 1981 in Chung Ang University Hospital. The results were as follows ; 1) The age distribution : Most common age group was 5th decade (15 cases, 27.2%) and the other age groups showed relatively even distribution. 2) The ratio of male to female ; 3 : 1. 3) The chief complaints were presented in following order ; cough (52%), hemoptysis (25%), dyspnea (23.6%), chest pain (18%), chest discomfort (9%). 4) Direct smear of bronchoscopic aspiration materials ; Not found 33 cases (60%) were the most common finding. In the founded bacteria, Gram positive cocci 2 cases (3.6%), Gram negative cocci 2 cases (3.6%), Gram positive bacilli 1 cases (1.8%), Gram negative bacilli 2 cases (3.6%), mixed form 15 cases (27.2%) were presented. 5) Bacterial culture of bronchoscopic aspiration materials : No growth 28 cases (50.9%) were most common finding. In the bacterial growth, alpha hemolytic Streptococci 10 cases (18.2%), Neisseria group 7 cases (12.7%). Klebsiella 2 cases (3.6%), Pseudomonas 2 cases (3.6%), mixed culture 6 cases (10.9%) were presented. 6) The diagnosis of bronchoscopic appearance, laboratory exam, and pathologic exam. Of biopsy specimens ; primary carcinoma of bronchus 21 cases (38.1%), pulmonary tuberculosis 8 cases (14.5%), bronchitis 7 cases (12.7%).