1. Judging from the number of words in the verses, ancient poetry can be divided into the so-called four-character poems, five-character poems, seven-character poems and miscellaneous poems. Four words are one sentence with four characters, five words are one sentence with five words, and seven words are one sentence with seven words. After the Tang Dynasty, it was called modern poetry, so it was usually divided into two categories: five-character and seven-character poetry. Five-character ancient poems are referred to as Wugu; seven-character ancient poems are referred to as Qigu, and those using both three, five, and seven characters are generally considered Qigu.
2. Ancient poetry is a poetry style relative to modern poetry. Before the formation of modern poetry, there were various poetry genres. Also known as ancient poetry and ancient style, it has three carriers: "song", "line" and "yin".