In this study . we analysis motor-fitness and draw out motor-fitness\'s factors of 292 girl students. ranging from age 9 to 12, selected from 3 different elementary schools in B city. With those students we measured 15 items of motor fitness such as strength(grip strength ) endurance ( sit-ups) power(standing long jump, 50m dash) agility (block transfer shuttle run, side step drill, bar-grapping reaction time) flexibility(sit and reach bend twist and touch) blance(closed-eyes balance ball balance) coordination (gifure 8duck. grass drill ) endurance(1000m run) for 2 weeks. For age 9 the first motor fitness factor is speed of change of direction the second is strength the third is balance the fourth is agility the fifth is speed. For age 10 the first is strength the second is coordination the third is speed the fourth is flexitility the fifthe is agility the sixthe is balance , For age 11 the first is coordination the second is strengh the third is flexibility the fourth is agility. For age 12 the first is coordination the second is strenth the third is speed the fourth is agility the fith is flexibility . We conclude that elementary school girl students have different structures of motor fitness factors and also different number of factors according to age.