The aim of this study was intended to analyze the correlation between body composition and eating bahaviors, activity bahavior,physical fitnessin elementary school students. The subjects consisted of a total of 311 elemantary school students including 163 boys and 148 girls of 5-6 grade. We measured physique, and body composition. body ocmposition variables were evaluated by bioelectrical impedance analysis(InBody 3.0 Biospace Co.) . The habits of diet and activity were also measured a questionnaire. All analyses were carried out by the statistical package, SPSS computer programs, Means and standard deviations were salculated and Pearson product Moment correlations were applied. The significance of all statistical variable was set to p<.05. The result of analysis of the correlation between body composition and eating beheviors, activity behaviors, physical fitness was as follows: 1. Correlation between body composition and habitof diet for between body composition and eating volume, eating speed, a significance was shown. There was nofignificance except for eating volume and eating speed. 2. Correlation between body composition and activity behaviors There was no significance between body composition and activity behaviors. 3. Correlation between body composition and economic/social/psychological factors There was no significance between body composition and economic/social/ psychological factors. 4. Correlation between body composition and physical fitness There was significance between body composition and physical fitness.