First, this poem is the author's famous poem, written in the first year of Yuanhe (806). The whole poem vividly describes the love tragedy between Tang Xuanzong and Yang Guifei. The poet used historical figures and legends to create a moving and moving story, and through the artistic image he created, he reproduced the reality of real life and infected readers for thousands of years. The theme of the poem is "Eternal Regret", and the second part begins with "The Six Armies have nothing to do if they don't attack". It describes in detail Xuanzong's hasty flight to Xishu after the An-Shi Rebellion, which caused the "Six Armies" to station themselves in the horse and demand the removal of the noble concubine who was causing harm to the country and the people. "Wan Zhuan'e Mei died before the horse" is the formation of tragedy. This is the key plot of the story. After Yang passed away, Xuanzong felt lonely, sad and full of lovesickness. The poem uses a sour and touching tone to describe Xuanzong's "eternal hatred", which is heartbreaking and makes people cry; "Linqiong Taoist Hongdu Guest" is the third part, describing Xuanzong's use of Taoist priests to help the illusory Penglai Fairy Mountain Traces of Yang were found. In the fairy scene, Yang's appearance of "pear blossoms in the rain" is reproduced, and he expresses his affectionate sentiments, entrusts the object with words, reiterates his previous vows, and expresses his willingness to be a "winged bird" and "connecting branches", further exaggerating the "eternal regret" theme. The ending further deepens the theme with "Heaven and earth will eventually end, and this hatred will last forever" and increase the weight of "eternal hatred". The whole poem is full of lingering emotions, and the book's hatred is endless. The writing is sad and moving, the tone is melodious and melodious. It is a famous piece through the ages, which is often read and always new. Contemporary writers Ding Yi and Fang Chao believe in the article "Evaluation of (Song of Everlasting Sorrow)" that this poem is a work by Bai Juyi to express his own feelings by chanting historical figures. The article said that when the poet was young, he fell in love with Xiang Ling, a girl from an ordinary family. However, due to the obstacles of family status and customs, he could not formally get married. When they broke up, the poet wrote a sad poem: "I can't cry, but I can't part with you; I can't speak, I miss you secretly; no one knows about the two hearts... There is no end to the mutual willingness." The article pointed out that "Song of Everlasting Sorrow" was composed a few months before the author's marriage. The poet was in pain for losing the possibility of meeting Xiang Ling. "I would like to be a winged bird in the sky, and a twig on the ground. Sometimes the eternity of heaven and earth will end, and this hatred will last forever." It is the poet who expressed his pain and deep feelings through the tragedy of the previous emperor's concubine. So this is supposed to be a love poem.