The so-called Feng, Ya and Song refer to the three categories classified by music in the Book of Songs.

"Wind" refers to the national style, that is, the folk songs of various countries during the Western Zhou Dynasty. "Ya" is the song of King Zhou's capital. King's capital was called Xia by Zhou people. In ancient times, Ya and Xia were the same, so it was called this. "Ya" is divided into Daya and Xiaoya, which means similar to the Daqu and Xiaoqu of later generations. "Song" means to describe and praise. It was a song used by the rulers at that time when they performed sacrifices.

The so-called Fu, Bi and Xing are the main expression techniques in The Book of Songs. "Fu" means to elaborate, to state things directly without using metaphors. "Bi" is a metaphor, comparing another thing to this thing. "Xing" means association, emotion caused by the scene, and excitement caused by things.

This artistic expression technique is the main visualization method in poetry creation, and has had a profound and far-reaching influence on the creation of poetry in later generations.