对体育教学中排球扣球助跑起跳技术的分析，提出排球扣球教学是排球基本技术教学中最难的一项教学。
Analysing approach jump technique of volleyball spike in teaching the author advances that volleyball spike teaching is the most difficult one in volleyball basic technique.
结果显示：（1）背越式跳高最大的优越性是弧线助跑起跳能经济实效的降低和升高身体重心，为身体重心运动方向的提早转变和垂直速度的提早积累、增大创造有利条件。
The result is :(1) the most superiority of flop is the approach can change the gravity of body, so that accumulate favorable circumstances for the transform timely of body-gravity.
结果显示：（1）背越式跳高最大的优越性是弧线助跑起跳能经济实效的降低和升高身体重心，为身体重心运动方向的提早转变和垂直速度的提早积累、增大创造有利条件。
The result is :(1) the most superiority of flop is the approach can change the gravity of body, so that accumulate favorable circumstances for the transform timely of body-gravity.
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