The realistic features of The Book of Songs are first reflected in its rich and colorful contents. It absorbs almost all the natural things that can be printed in the eyes and brought into the ears, which can be said to be an encyclopedia of life. According to the statistics of relevant scholars, there are 105 plants such as wheat, millet and hemp, 75 trees such as peaches, plums, cypresses and mulberry, 67 animals such as horses, cows, sheep and foxes, and 39 birds such as pigeons, yellowbirds, magpies and owls. The success of The Book of Songs lies in that its creation originated from what people saw and heard, which not only enriched the content of the article and enhanced its readability, but also described the simple style at that time and had a strong flavor of life.
The content of the Book of Songs really covers all aspects of life. Cao Liunan divided them into five categories according to their themes and contents: 1, love songs and love poems 2, labor poems 3, patriotic war poems 4 and political satires; 5. Epic and sacrificial poems. This shows that the content of The Book of Songs is all-encompassing, bringing together the bits and pieces of life. There are many poems describing sexual life. For example, more than half of the 160 poems in National Wind are about love and marriage, which fully shows the most primitive and true side of human nature and reflects the reality of slave social emotional life. Among them are gentlemen who yearn for love, girls who love spring, and women who are heartbroken and dissatisfied with autumn. Sorrow and joy of love, such as plucking the strings, are especially melodious, covering up the lingering sound, embellishing the ambiguity of the boudoir cage and depicting the beauty with tears.