From the literary style, the typical style of the ancient Seven Dynasties is correct, vigorous, solemn and elegant, while the typical style of singing is elegant and gorgeous. The preface to the analysis of the style of the article holds that "seven-character ancient poetry lies in bold sentences and ancient customs", and the style of "lyric for a long time" is different from that of "running script"
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Secondly, as far as the main characteristics of the style are concerned, the requirement of the seven ancient poems is to draw a clear line with the seven-character poems (including the seven laws and seven laws). There is a saying in Wang Shizhen's The Balance of Ancient Poetry in Qing Dynasty: "Seven words are indifferent. If the rhyme is flat, it must not be mixed. " In seven-character ancient poems, there are three sounds at the end of the sentence, and the sentence emphasizes loneliness and dullness, which are all reactions to metrical poems.
As for the Seven-character Song, although some early works are quite similar to the ancient Seven Dynasties in style and style, the phenomenon of legalization has become more and more serious in its evolution. According to Wang Li's China Poetics, there are 53 metrical and quasi-metrical sentences in Bai Juyi's 88 sentences of Pipa Xing, and the song of everlasting regret 120 accounts for as many as 100 sentences. The formation of this legalization trend is not accidental, it is the result of pursuing harmony of sound and rhyme due to the requirements of singing poetry.