An analysis has been made of two hundred seven patients who were treated at the department of Radiation Oncology of Korea University Hospital for lung cancer from January 1981 through December 1986. There were 137 patients of nonsmall cell carcinoma $(137/207,;66\%)$, 26 patients of small cell carcinoma $(26/207,;12.5\%)$ and 44 patients of unproven histology. By aims of treatment, there were 104 patients $(104/207,;50\%)$ treated for cure, 89 patients $(89/207,;42.9\%)$ for palliation and 14 patients treated postoperatively. In 22 out of 207 patients, chemotherapy was done with radiotherapy, 12 of which were patients with small cell carcinoma. Stage II patients were $49 (49/207,;23.6\%)$, stage III patients were $157 (157/207,;75.8\%)$ and one patient had an occult cancer The tumor was initial Iy measured by CAT scan and chest X-rays in the $165 (165/207,;79.7\%)$ patients, among which 117 patients had tumor diameter more than 5cm and 48 patients less than 5cm. Radiation therapy was given with Cobalt 60 teletherapy unit and the treatment volume encompassed primary tumor and the mediastinum. For curative aim, daily tumor dose of 180 cGy was given up to the range of $5,400~6,120cGy/30~34F/6~7$ week period and for palliative aim, daily tumor dose of 300 cGy was given up to the range of $3,600~4,500 cGy/12~15F/2~3$ week period. Postoperatively, mediastinum was treated for total dose of $5,040 cGy/28F/5.5$ week period. 123 patients $(123/207,;59\%)$ were followed up after completion of radiotherapy for 14 months to 7 years. Local tumor response to the irradiation was measured by chest X-ray taken at one month follow up and was evaluated for response rate, if they were regressed more than $50\%$ or less than $50\%$ of the initial tumor size. The treatment results were as follows; 1. The median survival time was 8.5 months and survival rates for 1 year, 2 year and 5 year was $25\%,;3.5\%;and;1\%$ of nonsmall cell lung ca of 74 evaluable patients. 2. More than $50\%$ of local tumor response rate was obtained in about half of overall cases; $90.5\%$ for small cell ca, $50\%$ for squamous cell ca, $25\%$ for adenoca and $57\%$ for large cell ca. 3. Response rate more than $50\%$ was seen in the $50\%$ of the patient group with tumor diameter more than 5cm and in the $55\%$ of those with tumor diameter less than 5cm. 4. By total raidation dose given, patient group which was given $5,400~6,120 cGy$ equivalent dose or higher showed tumor response rate more than $50\%$ in $53\%$ of the patients, whereas the group with dose less than 5,400cGy equivalent, in $25\%$ of the patients. 5. Survival rate for 6 month, 1 year and 2 year was compared between the group of local tumor response rate more than $50\%$ vs. group with response rate less than $50\%;;74\%;vs.;43\%,;33\%;vs,;23\%,;10\%;vs.;1\%$, respectively. 6. Local failure was seen in $21\%(44/207)$ of the patients, which occured mostly within 15 months after completion of radiation therapy. Distant metastases were seen in $49.7\%(103/207)$ of the patients, of which 43 cases were found before initiation of radiotherapy. The most common metastatic sites were bone and brain. In this sutdy, 1 year,2 year and S year survival rates were somewhat poor compared to the other studies. It mainly seems to be due to the poor general status of the patients and the far-advanced stage of the disease. In nonsmall cell cancer patients who had limited local disease and had small primary tumor size, we observed better local response. In addition, dose higher than 6,000 cGy group showed better tumor control than lower dose group. Survival rate was better fo..