Before the Han Dynasty, there were occasional five-character poems, but there were no complete five-character poems. Five-character poems first appeared and developed in Han folk songs and Yuefu folk songs. According to the indexes of Hanshu Wuxing and Yin Appreciation Biography, the ballads when the Western Han Dynasty proclaimed itself emperor have become a complete five-body; During the Eastern Han Dynasty, five-character poems emerged constantly and were adopted by Yuefu. Among them, Street Mulberry and Lotus Picking in Jiangnan are relatively mature five-character works.
The conceptual difference between "seven laws, seven sections and seven words" and "five laws, five sections and five words" obviously lies in "seven" and "five" This number is the number of words that make up a poem. Seven words and one sentence are referred to as "seven-character poems", "seven laws" and "seven laws" belong to the category of "seven-character poems" Similarly, five-character poems are called "five-character poems", while "five laws" and "five sentences" belong to the category of five-character poems. Therefore, seven words include seven laws and seven sentences, and five words include five laws and five sentences.
It should be noted that if a poem has both five-character poems and seven-character poems, it is neither a five-character poem nor a seven-character poem. It belongs to "miscellaneous poems", also called "long and short sentences". If you attach the word "brand", it is "brand". But when pushed to the extreme, five-word quatrains become difficult again. Because the number of words is limited, it is necessary to grasp a certain point very concisely and sensitively. To sum up, on the one hand, five-character and seven-character quatrains reflect the development of poetry rhythm, on the other hand, we can also see the poet's character and experience through the characteristics of poetry form.