This type of poetic structure is divided into first couplet, parallel couplet, neck couplet and tail couplet. This kind of poetry is also called ancient poetry or ancient style, which refers to a kind of poetry that is opposite to the poems produced before and during the Tang Dynasty. Its types are divided into Yuefu poems, five-character and seven-character ancient poems and singing poems. His representative works include Difficult Walking by Li Bai, Thoughts on a Quiet Night, Spring Hope by Bai Juyi and Spring Dawn by Meng Haoran.