The so-called rhymed poetry requires poetry to be written according to a certain metrical formula. The Tang people absorbed the rational core of the theory of four tones and eight diseases in the Yongming style poetry of the Six Dynasties and the parallel prose and parallel poems advocating the parallelism of parallel pairs, and further regularized it, resulting in the new style of rhythmic poetry. These rules mainly include: the pitch must conform to the rules of flat and oblique tones. That is to say, in a sentence, two characters should be used as a section to alternate between equal and oblique sounds, especially even numbers. For seven words, you only need to add 廄廄, which is different from the word 12 for five words, in front of it), then the couplet needs to be "廻仄仄平平" (for seven words, it is written as 平仄仄仄平平); and in Between the two couplets, that is, the sentences in the next couplet and the couplets in the previous couplet should be in harmony with each other. For example, if the couplets in the previous couplet of the five-character couplet are in an even tone, then the sentences in the next couplet should be in harmony with each other. Make 廄廄平平廄, and so on for the rest, repeating the final chapter. The syntax of words must meet the requirements of confrontation. Rhythmic poems are mostly composed of eight lines and four couplets. The four couplets can be called the first couplet, jaw couplet, neck couplet, and tail couplet respectively. The second and third couplets should be strictly antithetical sentences, and the first and fourth couplets can be correct or not. . Related to this, the five-seven-word quatrain style developed from the four-line poems of the Six Dynasties has also gradually become rhythmic, which is called Lvjue. Its rhythm and antithesis rules can conform to the first two couplets, the last two couplets, and the last two couplets in the rhymed poems. The middle couplet, or any of the first and last couplets. Because the verses and rhymes have distinct and harmonious rhythms and melodious and orderly tones, they become more catchy and full of musical beauty when read.