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The purpose of this study is to find influence factors of obesity and how obesity rate and obesity factors affect physical fitness, by investigating some predictable factors of affecting the obesity of Children in 5th and 6th grades, such as total daily energy consumption, total daily ingestion, energy intake. The subjects of this study were 132 male students and 129 female student in Seoul`s pravate schools, and they were divider into low weight, normal weight, and overweight, and obese by the measurement of obesity with the bioimpidence metho. total daily energy consumption, and physical fitness tests(flexibility, speed, power, muscular strength, muscular endurance, and the cardiovascular endurance) were examined. For data analysis, statistical analyses done in this study are T-test. The results of this study are as follows. 1. Total energy consumption, men had 1,238kcal(SD 335.76), and women had 1,383kcal (SD 338.29). 2. Total daily ingestion was 2,288kcal(SD 496.30) in the case of men and women had 2,153kcal(SD 555.85). 3. Ingestion in male had 1,859Kcal(SD 378.77), and female had 1,756Kcal (SD 380.22). 4. In the difference of physical strength factors according sex, men were superior in swiftness, and women in flexibility(P$lt;.05), and there was no difference in speed, muscular strength, muscular endurance and the whole body endurance. According to this study, daily total energy consumption of girls is higher than that of boys, whereas daily energy intake of girls is lower than that of boys. Also, boys have more both staple food and snacks than girls. Girls are therefore less fat than boys. Both higher grade boys and girls at elementary schools have more daily energy intake than recommended, while consuming less energy. Thus, it is found they lose their energy balance. Such result raises questions on children diet balance at their growing up ages. To consume less than intake indicates surplus energy would be accumulated in a body. It can conclude that girls with relatively average build at present are likely to be fat in a short period of time. Therefore, physical education at school needs to recognize the importance of fatness education; to develop a practical guide and .exercise programs that can lead healthy diet and more daily total energy consumption for children. In addition, since the results drawn from this study cannot give us information on the nutrition balance of children, further research into nutrition balance will be needed to evaluate children fatness and diet in depth. With regard to physical strength, both boys and girls record below average strength and need to build up their physical strength. Of various physical strength factors, the strongest one is muscular power at both boys and girls. Also, boys are best at prompt acting strength while girls are best at flexibility. For muscular power, speed, muscular endurance, whole body endurance, there are no differences between boys and girls.