This study was done to analyze the health behavior of 5.166 elementary students from a urban city. They were students in grades 4. 5 and 6 attending five elementary schools which were selected from a city close to the capital city of Seoul. Health behaviors were measured using a questionnaire which was developed by WHO and was used by European countries. The data was managed and analysed using DBASE and SAS computer programs. The results of this study were as follows: 1. Eating behavior $cdot$ Having Breakfast : Male students who were older had a higher number reporting having no breakfast(p< .05) $cdot$ Taking Supplements : Older students had a higher number reporting taking nutrition supplements(p<.05) $cdot$ Drinking milk: Female students had a lower number reporting drinking milk (p<.05). $cdot$ Taking snacks : Female students who were older had a higher number reporting taking snacks(p< .05). $cdot$ Drinking boiled water Male students had a lower number reporting drinking boiled water(p<.05). 2. Using seat belt Female students who were older had a lower number reporting using seat belt(p<.05). 3. Smoking : Male students who were younger had a higher number reporting experience with smoking(p <.05). 4. Personal hygiene $cdot$ Washing hands before meals : Male students who were younger had a lower number reporting washing hands before meals(p<.05). $cdot$ Brushing teeth: Male students had a lower number reporting brushing teeth(p<.05). 5. Reading distance : Younger students had a higher number reporting near reading distance(p<.05). 6. Exercise: Female students who were younger reported less exercise(p<.05). 7. Sewage Managing : Male students had a lower number reporting separating of garbage according to recyclability(p<.05).