With medium energy radiation treatment by 60Co teletherapy was observed primary lung cancer of 62 cases and adjunct change in the chest. The radiation therapeutic effects biased by initiation period of progression of tumor itself is well known facts. Of these 62 patients, 42 had completed a course of treatment with total tumor doses ranged from 4,000 rads to 7,000 rads. Patients were fractionally treated five times per week with weekly tumor dose of 1,000 rads. Among the 42 patients of sex incidence, 36 cases(86%) were male, and 6 patients(14%) were female. The maximum cancer incidence was found in 7th decade being in 16 patients (38.1%). Histopathological confirmation of 27 cases (64.2%) of primary pulmonary cancer is as follows; 9 patients (33.3%) of squamous cell carcinoma, 8 cases(28.6%) of undifferentiated cell carcinoma, 6 cases(22.2%) of oat cell carcinoma, 3 patients(11.1%) of adenocarcinoma and 1 case was carcinoid type of malignant bronchial adenoma. During the cours of treatment by weekly check-up of plain chest roentgenogram the onset of radiation pneumonitis was elucidated in 2-3 months following initiation of treatment and occurrence of fibrosis is individualized in 3-6 months in 16 cases of lung cancer among 62 cases. Follow-up about half of total cases of 1 year survival was 26.6 per cent. Lengthiest survival was in squamous cell carcivoma of well differentiated group and in undifferentiated carcinoma relatively short survival was seen. Supportive surgical and chemotherapeutic treatment seem to increase survival rate.