The main form of Jian 'an poetry is five-character poetry. Seven-character poems are mainly five-character poems. Five-character poetry is a new style of poetry that emerged in the late Eastern Han Dynasty. The appearance of "archaic poetry" in the Huan and Ling Dynasties marked the initial maturity of five-character poetry. The excellent five-character poems of "Seven Characters" are full of emotions and changes, which make the five-character poems more exquisite in art, such as Fang Si. The representative figures are mainly the seven sons of Jian 'an, and the name of "seven sons" began with Cao Pi's Dian Lun Paper: "Today's literati, Kong Rong Wenju, Guangling Chen Zhang, RoyceWong, Beihai Xu Gan Weichang, Ruan Yu Yuan Yu, Runan Yang Yingde Lian, Dongping Serina Liu, official to seven sons.
For example, in Cao Zhi's "Seven Sorrow", the bright moon shines on tall buildings, and the time is falling. There are women in the world who are sad and women who lament. Who is the signer? Yun is my son's wife. You have traveled for more than ten years, but I often live alone. If you clear the road dust and my concubine muddy the cement, when can we meet in harmony? May you die in the embrace of the southwest wind. What should I do if you can't open your arms?