本研究目的主要有二，一是分析及比較不同規格籃球在罰球線之出手角度、出手速度、出手高度、拋物線頂點高度及入射角度，二是分析及比較不同規格籃球在三分線之出手角度、出手速度、出手高度、拋物線頂點高度及入射角度。研究對象為8名大學女子甲組籃球選手（平均年齡21±1.20歲，身高172.12±5.04公分，體重63.25±6.26公斤）。研究方法利用一部高速攝影機，拍攝速率250Hz快門速度為1/1000秒，以及兩部數位攝影機拍攝在罰球線與三分線的投籃動作，資料分析採用描述性統計（平均數、標準差）及獨立樣本t考驗。研究結果發現：一、罰球線上，6號球之出手角度為61.36度，出手速度為6.96公尺／秒，出手高度為2.16公尺，拋物線高度為3.70公尺，而入射角為40.08度；而7號球之出手角度為60.73度，出手速度為6.85公尺／秒，出手高度為2.15公尺，拋物線高度為3.75公尺，入射角為41.47度。另外，6號及7號球在出手角度、出手速度、出手高度、拋物線高度及入射角度上，都沒有顯著差異。二、三分線投籃部分，6號球之出手角度為54.69度，出手速度為8.22公尺／秒，出手高度為2.04公尺，拋物線高度為4.30公尺，而入射角為47.58度；而7號球之出手角度為52.53度，出手速度為8.25公尺／秒，出手高度為2.04公尺，拋物線高度為4.28m，而入射角為47.05度。另外，6號及7號球僅在出手角度上有差異，但是在出手速度、出手高度、拋物線高度及入射角度則未達顯著差異。本研究發現國際籃球規則修訂，女子選手改採用6號球，此一變革對於女子罰球線投籃動作並無影響，但是影響三分線投籃之出手角度，建議女子選手在三分線投籃時應增加出手角度，可以提高命中率。

The purpose of this study was to examine the differences in kinematics of basketball shooting between different ball sizes at two distinct distances. Participants were 8 college women basketball players, in average age of 21±1.20 years old, 172.12±5.04cm in height and 63.25±6.26Kg in weight. Shootings with different ball sizes (size No.6, size No.7), at the distances of free-throw line and three-point lines, were filmed by a high-speed digital camera with speed of rate 250Hz and shutter of 1/1000, as well as two other digital cameras. The differences of kinematic parameters, including release speed, release angle, release height, the apex of projection and incidence angle, were further verified by the dependent-sample t test. The findings were as follow:1. No difference was found in release angle while shooting with two different balls at the free-throw line. Contrarily, the distinction of release angle between two different balls was reported at the three- point line. The angle of size No.6 was steeper than that of size No.7, which might relate to the reduction of muscle load.2. The difference in release height between two balls was found at the free-throw line. The height of size No.6 was higher than that of size No.7, which might result from a change in arm movement accompanied with the decrement of ball weight. Besides, no difference was found in release height at the three-point line.3. The differences in release velocity, the apex of projection, and incidence angle, were not reported between two different ball sizes at these two distances. Therefore, the reduction of ball sphericity was not enough to affect these three kinematic parameters of shooting.In conclusion, an alteration in shooting movement due to a change of ball size was found. The development of new defensive strategies will be necessary for women basketball players to benefit from their games.