As the interest in leisure sports is recently increasing domestically and internationally, the number of descending experience in the air facilities is increasing. Study on the cable and wire installed on a bridge has been actively preceded from the past to the present, but for descending experience in the air facilities for leisure sports, an accident occurs frequently and examination the structural safety of these facilities is still insufficient. Therefore, structural safety by dynamic impact is evaluated through 3-dimensional infinite element modeling and analysis of the steel cable for leisure sports previously installed. It is judged that more systematical safety than before could be secured based on this.