活塞笛是根据笛塞在管内左右运动能使笛音降低或升高的原理进行改革设计的。平时,笛塞由钢丝弹簧压紧在正常位置(见图),当持笛的下把手的大指将牵引绳环往笛尾方向一拉时,笛塞即向上移动,所奏的音就向下滑行;牵引绳一松,笛塞返回,产生向上的滑音。 Piston flute is based on the movement of the whistle in the tube left or right flute can be reduced or increased the principle of reform and design. Normally, the flute is compressed by the wire spring in a normal position (see the figure). When the big finger of the lower handle holding the flute pulls the pulling loop toward the direction of the tail, the flute moves upward and the sound is directed toward Lower glide; pulling rope loose, flute return, resulting in an upward slippery sound.