本研究旨在分析排球單、雙腳移位攻擊動作運動學表現，其主要目的為探討排球單、雙腳移位攻擊時位移速度、起跳速度、起跳膝關節角度與起跳高度差異情形。本研究以國立臺灣體育運動大學公開一級男子排球隊選手為受試對象，每人分別以單腳與雙腳兩種起跳方式進行分析。本研究以Silicon Coach動作分析系統進行分析，以成對樣本t檢定分析各項參數（單、雙腳起跳攻擊的位移速度、起跳速度、起跳膝關節角度和起跳高度）差異，統計顯著水準定為α＝0.05。經資料處理與結果分析討論之後，獲得下列研究發現：單腳位移速度（2.38±0.04m/s）明顯快於雙腳位移速度（2.28±0.07m/s）（p<.01）；單腳的起跳速度（0.43 ± 0.01s）表現明顯優於雙腳起跳速度（0.61 ± 0.03s）（p<.001）；起跳膝關節角度方面，雙腳起跳（118.55 ± 7.42°）度顯著低於單腳起跳角度（144.29 ± 4.73°）（p<.01），但是單腳的起跳高度（0.65 ±0.07m）則顯著低於雙腳的起跳高度（0.70±0.09）（p<.05）。單腳起跳攻擊有較佳的位移速度與較短的攻擊時間，建議各級教練人員可嘗試讓選手針對單腳移位攻擊進行訓練，進而幫助球隊發展更多元的進攻戰術。

　　The aim of this study is to determine physical performance of volleyball game by using one leg jump or two legs jump spike. We analysis the differences of period, velocity, angle of knee joint and height. All the candidates are the open grade division one volleyball players in National Taiwan University of Physical Education and Sport. Silicon Coach software to catch the data in this study. Paired-t test was used to analysis the differences between parameters which including the velocity of movement, the velocity of jumping, the angle of knee joint and the height. The statistically significant difference（α）is 0.05. This results are follows: the velocity of movement by using one-leg（2.38±0.04m/s）is faster than using two-legs（2.28±0.07m/s）（p<.01）; the velocity of jumping by using one-leg（0.43 ± 0.01s）is faster than that of two-legs（0.61 ± 0.03s）（p<.01）; the angle of knee joint by using two-legs jump（118.55 ± 7.42°）is lower than using one-leg（144.29 ± 4.73°）（p<.01）; however, the height of one-leg（0.65 ±0.07m）is lower than that with two-legs（0.70±0.09）（p<.05）.Moving spike with one-leg has faster moving velocity and shorter spike timing. We suggest all trainers could arrange more practice on one-leg moving spike, which could help the ball team to arrange different tactic.