One is called ancient poetry (or "ancient style"). The name originated in the Tang Dynasty. In the Tang Dynasty, the new metrical poems that appeared at that time were called modern poems, while those that originated from less metrical restrictions before the Tang Dynasty were called ancient poems. According to the Tang Dynasty, later generations called Yuefu folk songs, poems written by scholars before the Tang Dynasty and poems written by scholars after the Tang Dynasty "archaic poems". According to the number of words in poems, there are four words (such as The Book of Songs), five words (such as Han Yuefu's poems), seven words (such as Ge Yanxing by Cao Pi) and miscellaneous words (such as Li Bai's Difficult Road to Shu). Classical poetry rhymes freely.
One kind is called modern poetry (or "modern poetry"), which is a new style of poetry that appeared in the Tang Dynasty.
There are two kinds of modern poetry, one is called "quatrains", each with four sentences, which are abbreviated as five words and seven words. One kind is called "metrical poem", each poem has eight sentences, five characters are abbreviated as five laws, seven characters are abbreviated as seven laws, and more than eight sentences are called excluded laws (or "long laws"). The rhythm is very strict. There are definite sentences (except arrangement), definite characters in sentences, definite rhymes (definite rhymes), definite tones (definite tones of each word in the poem) and definite couplets (the two rhymes in the middle must be aligned).