This study was performed to figure out relations of self-esteem, anxiety and the other factors related with obesity in obese children. Methods Forty-two children(21 boys and 21 girls) those who were diagnosed obesity have been recruited. To assess psychological factors, Self-esteem inventory(SEI), Revised Children``s Manifest Anxiety Scale(RCMAS), International Physical Activity Questionnaires(IPAQ), Korean Eating Attitudes Test(KEAT-26) and Children``s Depression Inventory(CDI) were administered. Behavioral characteristics were also analyzed. Results Self-esteem(SEI) had significant positive relationship with physical activity(IPAQ) and sleeping time. Self-esteem had significant negative relationship with anxiety(RCMAS), eating disorder(KEAT-26) and watching TV time. Anxiety had significant positive relationship with eating disorder(KEAT-26) and watching TV time, and negative relationship with physical activity(IPAQ) and sleeping time. All of participants seemed to be having depressive tendency. Conclusion Self-esteem and anxiety were significantly related. And eating disorder, physical activity, sleeping time and watching tv also affected to the self-esteem and anxiety of obese children.