In recent years, the growing needs and the interest of the welfare for the disabled people has ignited the educational facilities for the disabled in Korea. This special schools are to be provide the disabled people with proper facilities to provide opportunities to participate in social life and to maximize the educational efficiency. However many special schools are not properly designed to educate the disabled because their design guidelines including legal planning standards. It is also true that these standards are not specifically categorized and specialized according to the kinds of disability. This study, therefore aims to suggest measures of the special school design guidelines especially for the mentally disabled people. The study first looks after the characteristics of the mental disability and the current situations of special schools in Gwangju. It, then examines the behavilr of the mentally disabled students in some of special schools in Gwnagju through observation and interview. The interview has done with the staff in the facilities regarding the usage patterns and behavioral characteristics of the mentally disabled students especially in convenience facilities in schools.