This poetic style originated in the period of Qi Yongming in the Southern Dynasties, and its prototype is Shen Yue's new poetic style which pays attention to rhythm and antithesis. In the early Tang Dynasty, it was basically shaped by Shen Quanqi and Song Dynasty, and matured in the prosperous Tang Dynasty. The whole article consists of eight sentences, each with five words. There are two basic forms: ascending and descending, and the two couplets in the middle must be couplets. Therefore, Wang Wei's Autumn Night in the Mountain is a five-character poem.