The possibility that elastic supported plate might impact more speed ball than rigid face has been the subject of conjecture in recent years. This impact phenomena was called the effect of trampoline. However the mechanism of the effect of trampoline has not been clarify explained. This sheet proposes to clarify the mechanism of the effect of trampoline by means of computer simulation. As the results of numerical analysis, coefficient of restitution increases when the period of elastic supported plate and duration of contact time of ball coincided with each other. Next, impact characteristics of non-linear support system calculated. As the results, the effect of trampoline is bigger linear support system.
