Taking "On the Phoenix Terrace in Nanjing" as an example, this paper discusses the main format norms of seven-character rhythmic poems.

There used to be a phoenix on the phoenix platform, and the phoenix went to Taiwan, only Jiangdong returned.

Martial arts flowers were laid on deserted paths, and the number of relatives and friends in the Jin Dynasty has become a famine.

The mountains are shrouded in clouds, such as blue sky, and the river is divided into two.

There is always a traitor in power, like covering the sky, and Chang' an is depressed when he can't see it.

①: Seven words and eight sentences, which is clear at a glance;

②: Wandering, flowing, hills, the mainland and troubles all belong to the eleventh rhyme department of Pingshui Xiaping, which is the general rhyme requirement of the seven rhymes. The first sentence can be rhymed, while sentences 2, 4, 6 and 8 must be rhymed and belong to the same rhyme department.

③: Two couplet vs. Three couplet, Wu Gong vs. Jin, flowers vs. clothes, burial vs. ancient hills, three mountains vs. two waters, half falling to the center, and heaven vs. Bailuzhou;

④: Flat, the flat format of this heptasyllabic melody is the first rhyme of the heptasyllabic melody.

⊙⊙仄仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 (rhyming)

⊙仄仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 仄 (rhyme)

⊙⊙仄仄, ⊙仄仄仄 (rhyming)

⊙⊙⊙ (rhymes)

The meaning of ⊙ for ⊙ can be even ⊙.

Basically, the above are the main metrical requirements of seven-character metrical poems.