We studied the nutritional status of on mentally handicapped children living at home or in institutions since early teenage years are nutritionally important. The subjects of 7 to 12 year old mentally retarded children attending a special education school in Seoul were surveyed with questionnaires as well as 2-day dietary recall records, with the help of persons of their care-giver when needed. Among the 64 children, 54.7% are living in institutions and the rest of them are living at home. They were ranged from the trainable (64.1%), the educable (26.6%), and the non-trainable (9.4%). Their average daily intake of energy intakes (%RDA) was 2,070.1 kcal (94.1%), Ca 603.9 mg (75.5%), Fe 11.1 mg (92.5%), Vt.A 507.5 RE (84.6%), Vt. B2 1.1 g (88.2%), niacin 14.1 g (93.6%) and Vt. C 58.2 g (83.1%). Their average intakes of these nutrients were significantly higher in subjects of institutions than at home. The nutrients consumed at a much higher level than the RDA of the normal children were Vt. B1 (1.6 g, 146.8%) and protein (75.3g, 136.9%). The higher percentage of children at home were under consumed of several nutrients (< 75% RDA) than ones in institutions. When comparing the degree of handicap, energy and nutrient intakes except Vt. C were highest in educable children than trainable ones or Dawn's children. MAR of the diets of the subjects was 0.84. Children at home showed lower MAR as well as NAR of each nutrients, whereas children belonged to INQ < 1 were less at home. Handicapped children at home were snacking higher amount relative to their calorie intake and too frequently, that may lead to their poor nutrition. There was positive correlations between factors of nutrition and physical and dietary behaviors, but there were no correlations between factors of nutrition and health-related habits. Nutritional caring mentally handicapped children in institutions seemed to be more effectively managed.