本研究目的是探討女子傳統壘球與新式壘球在運動力學上的差異。研究可分為三部分：第一部份是瞭解兩種壘球碰撞球棒之彈性恢復係數的差異。第二部分是瞭解兩種壘球碰撞測力板之峰值的差異。第三部份是瞭解兩種壘球碰撞球棒之振動響應的差異。 研究的方法是將國際標準的Mizuno壘球棒握柄固定於測力板平台上並找出甜區，再將壘球固定於100公分的高度，經自由落體的方式碰撞於球棒的甜區上，並利用BioWare擷取資料再經快速傅麗葉轉換(FFT)得振動響應資料。另外，彈性恢復係數的資料擷取是利用高速攝影機，快門速度1/500秒，拍攝速度(PFS) 250張／秒，並利用Redlake軟體求出壘球碰撞前後的速度及彈起高度。 本研究經分析結果得到下列結論： 一、在彈性恢復係數上，新式壘球0.586高於傳統壘球的0.558。 二、在力量峰值上，不管是碰撞測力板或是球棒，新式壘球皆大於傳統壘球。 三、在振動響應上，新式壘球碰撞球棒後所產生的振動大於傳統壘球碰撞球棒所產生的振動。

The purpose of this study was to research kinetics differences between women's traditional and new style of softball. The study is divided into three major parts: (1) To discussing the differences between the COR K coefficient of restitution) as ball hits the bat in these two different softball. (2) To realizing the differences between the peaks of impact of the two types of softball on force platform. (3) To analysis the differences between the vibration response as the balls hit the bat. The study method was used international standard Mizuno softball bat fixed on the surface of force platform. The sweet spot is determined. The softball is then dropped from a 100 centimeters height to impact the sweet spot of bat. Using BioWare Biomechanics analysis software, data is processed through FFT to obtain frequency domain vibration data. Data of COR are captured with the high speed camera. Then, by using Redlake software, the speeds and rebound heights of the softball after impact are calculated. The conclusions of this study indicated: 1. New style of softball has a COR of 0.586, higher than traditional softball 0.558. 2. On the peak, new style softball shows higher computation than traditional softball, both on the force platform and the bat. 3. On vibration response, new style of softball causes greater vibration upon traditional softball when the softballs impacted the bat after.