Poetry before Qin unified all countries was pre-Qin poetry. Pre-Qin poetry includes The Book of Songs, Songs of Chu, some traditional folk songs in the Spring and Autumn Period and the Warring States Period, and some primitive social songs. The source of ancient poems contains folk songs and ancient ballads. Pre-Qin poetry is the source of China's traditional poetry, among which The Book of Songs is the source of China's realistic poetry, and Chu Ci is the source of China's romantic poetry.