The purpose of this research is to prove how the string play effects to basic physical capacity & concentraion ability of elementary girl students. For diong this research the researcher divided 40 girl students who are the students in B elementary school which is in Ansung-Si , Kyunggi-Do into one experimental group& one control group. The experimental group had a 10-week program of the string play. The students took the physical capaty tes after group A had the program. The test consists of 50m funning, wit - up, 1000m running the running board jump, bending forward. Moreover for testing of concentration ability Harris & Harrisgrid was used. Group A had 10-week program which consists of 40-minute-everyday string play. On the other hands , group B had no program, AS a result , the followings were obtained. 1) At the pre-test, there were no significant differences between two groups in agility, ability to react instantly, flexibility, ability of abdominal muscles, cardiovascular respiratory endurance concentration ability. That proves two groups have the same quality. 2) As the result of pre-and post-test in the experimental group(groupA) there were significant differences in ability to react instantly, agility flexibility, concentration ability while there were no noriceable vhanges in ability of abdominal muscles, cardiovascular respiratory endurance 3) As the result of pre-and post-test on the control group , there were no notiveable hanges in ability of abdominal muscles, cardiovascular respiratory endurance ability to react instantly, agility, flexibility, concentration ability. In the view of result above, The string play had very positive effect on improving basic physical capatities such as ability to react instantly, agility, flexibility, and concentration ability over elementary girl students. * the string play = 고무줄놀이