《六幺》是唐宋时期广为流行的乐曲。本文指出,《六幺》在唐代即有歌、大曲、器乐曲、软舞曲以及词调《六幺令》等不同的音乐形态,这些形态到宋代都有了新的变化,《六幺令》还进入到了南戏之中。宋代还出现了杂剧《六幺》以及各种形态的《六幺花十八》。《六幺》形态的这些变化充分显示出乐府对后世音乐、文学的深刻影响。 “Sixth” is widely popular music during the Tang and Song Dynasties. This paper points out that there are different musical forms such as song, big song, instrumental music, soft dance music and “six sets of words” in the Tang Dynasty. All these new forms have changed to the Song Dynasty, Also entered into the South play. Song Dynasty also appeared in the drama “six unitary” and various forms of “six-unitary flower eighteen.” These changes in the “six unitary” form fully demonstrate the profound influence Yuefu has on later generations of music and literature.