At the same time, as the inheritors of The Book of Songs and Songs of the South, ancient poetry also reflects the history of the development and changes of poetry since the pre-Qin period, from which we can get a glimpse of both the source of Tang poetry and the subtleties of The Book of Songs and Songs of the South. As The Book of Songs and Songs of the South have been widely collected and circulated, this book is not included in its chapters. Shen Deqian also believed that the songs of ancient emperors, such as "Resisting Qu" and "Digging the Earth", were "poems that opened the voice" and were the originator of poetry. China's poetry is good at five words, and Yuefu poetry is its essence. At the end of Han Dynasty, Jian 'an poems were numerous and made great achievements. As for the Southern Dynasties and the Song Dynasty, the style and system of poetry changed greatly and gradually became vulgar. This book expounds in detail the evolution history of poetry before the Tang Dynasty and truly traces the source of poetry.