The purpose of this study was to investigate the effect of body image self-discrepancy on physical self-concept, depression and eating disorder. The subjects of this study consisted of 437(226 boys and 211 girls) high school students. The used instruments were Jo(2006) for measuring body image and Kim(2001) for measuring physical self-concept and Seo(2006) for measuring depression and Sin(1997) for measuring eating disorder. The data was analyzed by two way ANOVA, Chi-square test, correlation analysis, simple regression analysis as a statical method. The result of this study was as follows. First, among the subscales of physical self-concept according to gender is that sport competence, physical activity and endurance of schoolboys was significantly higher than that of schoolgirls. And sport competence, body fat, appearance, physical activity, endurance of actual group(-) was significantly higher than that of actual satisfaction group and actual group(+). Second, actual group(-) have higher depression than actual satisfaction group and actual group(+). And in case of schoolboys, actual group(-) and actual satisfaction group have higher depression than actual group(+). Third, anorexia of schoolgirls was significantly higher than that of schoolboys. And anorexia of actual group(-) was significantly higher than that of acutal group(+) and actual satisfaction group. And bulimia of actual group(-) was significantly higher than that of actual group(+) and actual satisfaction group. Fourth, body image self-discrepancy positively influenced physical self-concept and negatively influenced depression, eating disorder. Fifth, physical self-concept negatively influenced depression and eating order. Sixth, depression positively influenced eating disorder.