This report is a retrospective review of histologically proven 106 primary lung cancer patients treated in the Dept. of Tumor clinic, PMC from Aug. 1986 to May, 1989. The results were as follows : 1. 94 cases were male and 12 cases were female with average age of 57.7 year-old. 2. histologically, the cancers were composes of 50 cases(47.1%) of epidermoid carcinoma, 38cases(35.8%) of adenocarcinoma, 13 cases(12.25) of small cell carcinoma, 5 cases(3.1%) of large cell carcinoma. 3. Generalized symptoms were weight loss, fatigability, fever and headache in the frequency order, And there were chest symptoms such as chest pain, coughing, dyspnea, hemoptysis and sputum production. 4. Lung cancer occurred frequently on the right side than the left one, and on the upper lobes than the lower ones. The occurrence ration between central typed carcinomas and peripheral ones was 2.8:1, and most of them were poorly marginated masses with more than 5cm diameter in average size. 5. Epidermoid carcinomas showed more atelectasis and cavity formations than the other typed carcinomas. Adenocarcinomas showed most common secondary effects of bronchial obstruction such as atelectasis and pneumonia, emphysema and frequent intra-pleural metastasis. There were so early hilar and mediastinal lymph node involvements in the small cell carcinoma cases like as the large cell carcinomas that they showed high degrees of diagnostic staging at the initial time of cancer diagnosis. 6. Most of the patients (911 cases, 85.85) of the primary lung cancer revealed above Stage IIIa. In theses data, we can conclude that the clinical symptoms, characteristics of the CT scanning gical cell typing and to make the therapeutic plants or the primary lung canners.