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The purpose of this study was to look into the factors influencing ability of the game and to give information on selecting the superior player. In elementary school, twenty boys of sixth grade were selected as subject for swimmer, football player, and athletes. It measured and compared eight items of physique, four items of body composition and six items of physical fitness as test items The correlation was analyzed to find out the relationship of physique to body composition, physical fitness to body composition, and physique to physical fitness in each sports. 1.The comparison of swimmers, football players, and athletes physiques. 1) The football player was to swimmer and athletes only in the thigh girth 2) Standing height, sitting height, upper limb length, lower limb length, upper arm girth, and body weight all had little significance. Football players had the same standing height, siting height, upper limb length, lower limb length, upper arm girth, chest girth, and body weight as swimmers and athletes. 2. Body composition comparison. 1) Swimmer was better than football player and athletes in percentage of body fat(%fat) and body fat(%TBF). 2) Football players were superior to swimmer when comparong body density. 3) There were no significant differences in lean body mass. 3. Comparison of physical fitness 1) Athletes was superior to swimmer and football player in muscular endurance, power, flexibility and agility. 2) Ther weren`t any significant differences in muscle strength and balance. 4. The correlation analysis of physique, body composition, and physique fitness. 1) The interrelationships of the swimmer`s The swimmer had significant interrelationship between standing height and sitting height(.947), chest girth and body weight(.929), body density and percent body fat(-.999), grip strength and upper limb length(.844), and standing long jump and body density(.699). 2) Interrelationships of football player The football player had significant interrelationships standing height and sitting height(.952), thigh girth and upper arm girth(.926), body weight and lean body mass(.955), percent body fat and total body fat(.971), and grip strength and upper limb length(.903). 3) The interrelationships of the athletes The athletes had the significant interrelationship in the parts of standing height and upper limb length(.970), upper arm girth and grip strength(.772) body weight and total body fat(.991), percent body fat and total body fat(.828), and standing long jump and sitting height(.743) 5. The canonical correlation analysis of physique, body composition and physical fitness Swimmer, football player, athletes all had high interrelationships between physique and body composition(.987), body composition and physical fitness(.973), physique and physical fitness(.967).