This study was to investigated the dietary behavior and fast foods use among Korean youth in order to obtain basic information of nutrition education for them. Survey was carried out through questionnaire and the subjects were 236 boys and 388 girls of 4 middle schools in Seoul. The questionnaire included use frequency of Korean and foreign fast-foods, preference, concepts regarding prices, fullness, choice factors, dietary habits and nutritional Knowledge. The results are summarized as follow : 1. Overweight students(52.8%) were more than normal(43.1% ) and low body weight students (4.2%), classified by Roher index. 2. Moat students(78.9%) had very good or good food habit, 52.6% of boys and 44.0% of girls were having breakfast regulary. 46.1% of subjects had fast-foods once or twice in a week and girl subjects used more than boys. 3. Nutritional knowledge of the subjects was satisfiable and normal and overweight groups were better than underweight group, 4. Fast-foods most students liked were duckbocki(81.1%) fried chicken(80.9%) french fried potatos(80.4%) mandoo(78.1%) kimbab(78.9%), and fried chicken(77.9%). 5. 57.9% of the subjects wished to develope Korean traditional food items into fast-food style.