The final version of Five Laws was finally completed by Song and Shen Quanqi. They were born later than Li Qiao and Du Fu, and were elected to the DPRK as officials because their literary talents were appreciated. They are the representatives of Taige poets in Wuhou period. Living in the forbidden palace and pavilions, their poetry creation is mostly limited to singing, farewell, embellishment and flaunting elegance, which inevitably leads to poor content and words. At the same time, it also gives them enough time to ponder the art of poetry, strive for perfection in the law of poetry, avoid getting sick and make accurate sentences. Specifically, in addition to worrying about the difference between the light and heavy in a couplet, it is also required that the antithetical sentences in the previous couplet and the sentences in the next couplet are flat and parallel. This fitting law runs through the whole article, making the couplet of a poem flat and parallel, and the melody is harmonious throughout the whole article. Yuan Zhen's Preface to Du Jun's Tomb, Yuan Wailang, the Ministry of Industry of the Tang Dynasty, said: "Tang Xing, the official study was greatly boosted, and the world was handed down from generation to generation, and talented people came out. Shen and Song Shu, refined and steady, are called regular poems. " This is the earliest record about the naming of "rhyme", so the names of Shen and Song became the symbol of "rhyme" stereotype.