本研究目的是在探討兩種不同拋物線軌跡在籃球投籃動作上之相關運動學參數的差異比較；另外，檢驗經由影片分析法所求得之投擲速度其精確度為何？受試對象為國立台北師範學院體育學系甲組籃球隊學生共十名。本實驗以一部JVC攝影機沿受試者矢狀面繞橫軸進行2D原地投籃動作之拍攝，拍攝頻率為30Hz，影片擷取後以Silicon Coach vision-6.0版動作分析系統予以數位化，以獲得相關投籃運動學參數，並應用拋射體公式求出投擲速度之參數值。實驗結果以T-test檢定兩種不同投籃拋物線軌跡在運動學上之差異，顯著水準a定為.05；且以拋射體公式作為效標，將影片分析法求得之投擲速度參數值，使用估計標準誤來檢驗其精確度。經實驗結果予以討論後得到以下結論： 一、兩種不同拋物線軌跡之投籃動作在上臂角、投射角、投擲速度、拋物線頂點、入射角、飛行時間等參數上均達顯著差異。 二、以拋射體公式作為效標，經由影片分析法所求得之兩種不同拋物線軌跡的投擲速度參數值，其精確度極高。 三、以罰球線投籃分析中所示，高拋物線投籃之投射角不在最佳投射角範圍內，而一般拋物線投籃之投射角則在最佳投射角範圍內。 四、一般拋物線投籃的入射角及投擲速度較小，命中率較高。

　　　　　The purpose of this research was to compare and analyze the dissimilarities between two different projective trajectory of shooting on basketball in kinematics, and to check the precision of initial speed of film analysis. The subjects were composed of ten elite basketball players who major in physical education of National Taipei Teachers College (age 21 ± 1.2yrs,tall 177 ± 2.7cm,weight 67.7 ± 5.1kg). The performance of the subjects was filmed by JVC digital video (30Hz) and to be analyzed on two dimensions in sagittal plane and horizontal axis. These devices were used to document the primary parameters, including horizontal angle of upper arms, initial speed of release, angle of release, the time of projection, the apex of projection, angle of entry and so on. The data were digitized by Silicon Coach vision-6.0; to obtain the parameter of initial speed of release, the projective formula were used. T-test was applied to the parameters to estimate the differences between the two different projective trajectory of shooting, and the level of significance a is .05.With the projective formula, according to the standard error of estimate, the precision of the initial speed of release by film analysis was examined. Finally, the various factors about the horizontal displacement of these two different projective-shooting whether it target or not were compared. Results showed: (1) the parameters of two different projective trajectory of shooting are significant; (2) according to the projective formula, the parameters of the initial speed of release from the filming analysis were extremely precise; (3) on free-shooting, the angles of release on the higher projective-shooting were not within the range of optimum angles of release. On the contrary, the angles of release on the normal projective-shooting were within; and (4) the angle of entry about the higher projective-shooting was much more than the other one, but the percentage of free-shooting was much lower﹒It was because the initial speed of release and angle of release of the higher projective-shooting can not be handled easily, so the horizontal displacement was either more or less than it is from the center of basketball to the center of basket.