Five-character poetry is a genre of ancient Chinese poetry. Refers to a five-word poem, and the whole poem consists of five words. Five-character poems are formed by absorbing Han folk songs. Five-character poems can accommodate more words, thus expanding the capacity of poems and expressing feelings and narratives more flexibly and meticulously. In terms of syllables, even-odd matching is more musical. Therefore, it is more suitable for the social life developed after the Han Dynasty, thus gradually replacing the orthodox position of four-character poetry and becoming one of the main forms of classical poetry. Modern poetry appeared after the early Tang Dynasty, including five-character poems and five-character quatrains. The five-character poems before the Tang Dynasty are generally called "five-character ancient poems" or "five-character poems".
Seven-character poetry is one of the genres of Chinese poetry. The whole poem has seven words in each sentence or seven main words. Han folk songs originated in the pre-Qin and Han dynasties. However, there are few seven-character poems between Han and Wei dynasties, which gradually developed from the Southern and Northern Dynasties to the Sui Dynasty and didn't really develop until the Tang Dynasty, becoming another main form of Chinese classical poetry.