This study is purposed to analyze the reasons of participations of elementary-middle school heavy gymnastics players and to develop the paper to examine the motives of participation that can induce the fostering of heavy gymnastics players, enhancement of performance abilities and increased participations. With the 63questions earned from literature examinations, interviews and open type questionnaires, two times of careful selection of questions were conducted by experts, consequently leaving 32questions for the major test. As a result of 1st and 2nd exploratory cause analysis by 565people with this questionnaire, 12 questions were also deleted which cause common property and cause accumulated value were to standard value or under, consequently leaving 20questions. Through 3rd exploratory cause analysis, 5causes and 20questions were hammered out, and with these, confirmational cause analysis was executed. It revealed that all were over the judgment criteria of fitness thus the structural model was shown to be suitable and so developed the paper to test the motives of participation of elementary middle school heavy gymnastics players.