The author had observed 48 cases diagnosed as oral malignancies of the patients who visited to the infirmary of Dental College of Seoul National University from 1973 to July 1976. The following results were obtained. 1. 5 decades age group showed the highest incidence and there was hardly difference in sex. 2. From the histopathological view point, most of cases were squamous cell carcinoma. 3. Most of cases were considerably in advance and showed the bony destruction not only primary site, but of surrounding structures.