Before the Tang Dynasty, the Liang Dynasty produces the largest number of music and dance poems, which provides beneficial experiences and references for those in the Tang Dynasty. Compared with music and dance poems of the Tang Dynasty, especially with those of the Middle Tang Dynasty, music and dance poems in the Liang Dynasty differ greatly in description subject, function, and writing purpose. Firstly, music and dance poems in the Liang Dynasty changes from mere description of the dancing posture and looks of the performers to paying much attention to the choreography in the Tang Dynasty; secondly, it changes from aesthetic and entertainment function in the Liang Dynasty to the multiple functions, e.g. amusement, enlightenment, and political education in the Tang Dynasty; lastly, the former depicts the external objects, while the latter expresses emotion and aspiration. In a word, music and dance poems in the Liang Dynasty are for the purpose of entertainment, while those in the Tang Dynasty are for that of rites and music.