A clinical and histopsthological study were done on 1,817 biopsied inflarnmatory skin diseases among 58,386 out-patients in Dermatologic departrnent of Korea University Hospital during the period of 24 years from January, 1962 to Decernber, 1985. The results were summarized as follows : 1. According to pattern analysis(Ackerman AB), 1,605 cases(88.3%) of inflammatory skin diseases were classified into 9 patterns and by author's modified pattern analysis, additional 437 cases could be classified. 2. Of the 1605 cases which were classified by 9 pattern analysis, 1185 cases(78.8%) of inflamrnatory skin diseases were diagnosed as individual disease entity. The ratio of accordance between the histopathological diagnosis and clinical diagnosis on the biopsied inflammatory skin diseases was 44.5%, 3. The ratio of accordance between the histopathological diagnosis and clinical diagnosis by the patterns were '. Vasculitis(75.5%), Subepidermal vesicular dermatitis (73.3%), Nodular and diffuse dermatitis(68.2%), etc. 4. The diseases showing above the 70% accordance were scleroderma, erythema induratum, vitiligo, arthropod reaction, etc; and the diseases showing under the 30% accnrdance were erythema multiforme, erytherna annulare centrifugum, neurodermatitis, etc.