在排球比賽中，四號位長攻舉球的優劣與四號位扣球的成敗關係密切，優秀的舉球員往往能將場上的突發狀況化險為夷，於比賽中為球隊製造更佳的攻擊機會。目的：比較國家隊與大專特優級之舉球員處理球接至邊線時的四號位長攻舉球動作是否有差異。方法：國家隊舉球員2名與大專特優級舉球員2名進行舉球測驗，5球一組、共舉20球，以高速攝影機拍攝運動學資料。以獨立樣本t檢定來比較國家隊與大專隊之差異。結果：國家隊四號位長攻舉球滯手時間0.14（sec），大專隊0.12（sec），沒有達到顯著差異。國家隊球離手球速為5.26（m／s），大專隊為5.11（m／s），沒有達到顯著差異。國家隊出手角度為76度大於大專隊的72度，有達到顯著差異。國家隊球觸手時步幅為55公分，高於大專隊的40公分；球離手時步幅，國家隊52公分，高於大專隊的39公分，有達顯著差異。穩定性為國家隊（30%、20%）高於大專隊（10%）。結論：國家隊與大專隊舉球員之出手角度，球觸手、球離手時之步幅均達顯著差異，國家隊舉球員舉四號位長攻球之穩定性高於大專隊。

Objective: The main purpose of this study is to compare the differences of movements between the setters of national teams and college teams when setting the ball from the side line to the 4^(th) position. Method: Two national team setters and two college team setters took 20 balls in the test. Two high-speed cameras were used to record the kinematic data. The independent t-test was used to make a comparison on both the national team and the college team. Result: There were no significant difference in the duration time of ball and hand contact between the national and the college team setters. There was no significant difference in the volleyball initial setting velocity. The angle of setting the ball of the national and the college team players was the 76 degree and the 72 degree respectively. For the national team player to perform touching the ball, the stride length between the left feet and the right feet was 55cm, which was greater than 40cm of the college team player. For the national team players to perform throwing out the ball, the distance between the left feet and the right feet is about 52cm, which was better than 39cm of the college team players. It appears that the stability of the national team players is better than that of the college team ones. Conclusion: National team players and college teams move the angle of the shot, the ball tentacles, hand the ball off stride when the reached a significant difference. Therefore, the stability of setting the 4^(th) position of the national team players is better than the college team players.