Seven-character verse is strict, which requires the unity of words in the poem. It consists of eight sentences, and each sentence has seven words. Every two sentences are a couplet, and * * * is a quadruple, which is divided into first couplet, parallel couplet, neck couplet and tail couplet. The two couplets in the middle demand antithesis. Representative works include the Yellow Crane Tower in Cui Hao, Du Fu's Ascending, and Li Shangyin's Stabilizing Tower.
Poetic meter
Seven-character metrical poetry refers to seven-character and eight-sentence poetry, which conforms to the norms of metrical poetry. Its meter is very strict, and there are strict rules in terms of words, rhymes, leveling and antithesis.
The length of seven-character verse is fixed. Eight sentences, seven words each, * * * 56 words. The first and second sentences are called "first couplet", the third and fourth sentences are called "parallel couplet", the fifth and sixth sentences are called "neck couplet" and the seventh and eighth sentences are called "tail couplet".