Sixty-six patients with squamous cell carcinoma of the oropharynx were treated with radiation therapy and retrospectively analyzed to evaluate the treatment result in the Department of Therapeutic Radiology, Korea Cancer Center Hospital between January 1980 and December 1986. There were 42 patients with carcinoma of the tonsil including the fossa and pillar, 9 patients with carcinoma of the base of tongue,12 patients with carcinoma of the soft palate, and 3 patients with carcinoma of the posterior and lateral pharyngeal walls. Considering all oropharyngeal sites of involvement together, response rates for T1, T2, T3, and T4 were $80\%,;77\%,;and;40\%$, respectively, with a overall response rate of $70\%$. The response rate for N1, N2, and N3 were $69\%,;63\%,;and;40\%$, respectively, with the overall regional response rate of $70\%$. In lower T status, undifferentiated carcinoma and primary tumor arising from the soft palate, higher response rates were obtained. The S year overall and disease-free survival rate were $56\%,;55\%$, respectively. A better prognosis was obtained in early T stage (T1+T2) (p<0.01) and in patients without tumor extension into adjacent structures in carcinomas arising from tonsillar area (p<0.01). Through this study we suggest that, in terms of anatomical and functional preservation, radiation therapy seems to be an effective method for the primary treatment of patients with oropharyngeal carcinoma.