"Yuefu Double Wall" refers to the most outstanding folk narrative poems in ancient my country, "Peacock Flies Southeast" and "Mulan Poetry". "The Peacock Flies Southeast" is the first full-length narrative poem in the history of Chinese literature, and together with "Mulan Poetry" is one of the two masterpieces of Yuefu. It is based on a marriage tragedy that occurred in Lujiang County (now part of Anhui Province) during the reign of Emperor Xian of the Eastern Han Dynasty. Originally a folk song, it may have been processed and polished by later generations of literati. "Poetry of Mulan" is a long narrative folk song from the north of my country during the Southern and Northern Dynasties. It tells the story of Mulan, who disguised herself as a man, joined the army on her father's behalf, fought on the battlefield, returned to the court in triumph, received a title for her meritorious service, resigned from office and returned home. It is full of legend.