The Book of Songs is the source of China's romantic poetry.

What you want to ask is: Is The Book of Songs the source of China's romantic poetry? No, The Book of Songs is the beginning of China's ancient poetry and the earliest collection of poems. Qu Yuan is a great patriotic poet in China's history, the founder of China's romantic literature, the founder and representative writer of Songs of the South, who initiated the tradition of "vanilla beauty" and was known as the "father of Songs of the South". Song Yu, Jing Ke and other famous poets in Chu were all influenced by Qu Yuan.