The purpose of this study was to inspect it what kind of influence it has on the development of the motor ability of the childhood period that growth speed of the body mass is relatively bigger than growth speed of the stature by the allometric analysis (y=bx^α). The materials used for this study were the longitudinal data of the stature, body mass, body composition, and the motor ability of 31 girls whose aged form 2.5 to 5.5 years old, taken in 2006-09. The results obtained were as follows; 1) Mean allometry coefficients of stature and body mass is 1.86. 2) The increase of the BMI of the high group was increase of the body fat ingredient. 3) It may be said that a low group can be superior to the motor ability than the high group where increase of the weight is remarkable when I evaluate an motor ability by the same stature and the same body mass. We suggested that it only promoted increase of the body fat to add body mass and body size for the childhood period, and possibility to obstruct the development of the motor ability.
