After the classics were liberated from "learning is the official", they were widely circulated after finishing and processing by scholars at that time. Confucius has made great contributions to sorting out ancient documents. There are many differences between the early Book of Songs and the Book of Songs that has been handed down to this day. A survey of 10 poems quoted in Mo Yu reveals that there are four poems that are not found in The Book of Songs, and 1 poems are basically the same, while the others are different. Sima Qian said in Historical Records Confucius Family that the Book of Songs was compiled by Confucius from "more than 3,000 poems". There are more than 3,000 original poems, which are inevitably exaggerated, but there are more than 300 existing poems. The article Mozi Meng Gong says that Confucianism "recites 300 poems, sings 300 poems and dances 300 poems" and Confucianism "sings 300 poems and gathers disciples" (Mozi is not a Confucian). It can be seen that there are more than 300 original poems, and the existing Book of Songs was handed down by Confucius and Confucianism during the Warring States Period.