In ancient times, poetry collection was poetry collection, and "wind" was "wind poetry", that is, the fusion of the Book of Songs-"national wind". "Preface to Mao Poetry" says: "The wind and frost are on the top, and the wind and thorns are on the bottom, and the main text is admonition. The speaker is innocent, and those who smell it are enough to quit. So, the wind. " This shows that the Han people think that "Wind Poetry" has the function of political remonstration to reflect public opinion, and the rulers' tolerant attitude towards this kind of public opinion and satire is in line with the former Wang Zhidao. There are many kinds of records about the system of "collecting poems" in ancient books of the Han Dynasty, among which three records in the following two books have the greatest influence:

In ancient times, there was an official who collected poems, so the king observed people's feelings, knew the gains and losses, and tested himself. ("Han Shu Literature and Art")

Let people go to the wild in spring and into the city in winter. ..... Men and women each have their own shortcomings, because they are singing, and each has its own injuries. ..... Meng Chunyue, a group of people scattered, pedestrians asked Mu Duo to collect poems on the road and offer a surname to win his temperament, which was heard by the emperor. Therefore, Wang knows the world without watching the door. ("Hanshu Shihuozhi")

Men and women hate each other, so they sing, hungry people sing about their food, and laborers sing about their affairs. Male 60 years old, female 50 years old, childless, given food and clothing by the government, made him seek poetry among the people, moved his hometown to the city, moved the city to the country, and the country was known to the son of heaven. Therefore, the king stays at home, knows the sufferings of the world, and knows the four directions without attending classes. (He Xiu's Biography of the Spring and Autumn Ram, Fifteen Years of Gong Xuan)