The author of Song of Everlasting Regret was Bai Juyi, a famous poet of the Tang Dynasty. He was born in 772 AD and died in 846 AD at the age of 68. Bai Juyi was a famous writer and politician in the Tang Dynasty. His poems had profound thoughts and unique artistic style, and he was known as the "Poem Demon" and "Poem King". Bai Juyi's poems covered a wide range of styles, including lyric poems, narrative poems, Fu, Yuefu, etc. Among them, the most famous ones were Song of Everlasting Regret and Song of the Pipa. Song of Everlasting Sorrow was one of Bai Juyi's representative works. It was a long narrative poem that described the love story between Emperor Xuanzong of the Tang Dynasty and Yang Guifei, as well as the debauchery of Emperor Xuanzong of the Tang Dynasty and the sacrifice of Yang Guifei. It had profound social significance and historical value. Song of the Pipa, on the other hand, was a poem describing the life of a pipa girl. Through the story of the pipa girl, it reflected the darkness and corruption of the Tang Dynasty society, showing Bai Juyi's deep thoughts on human nature and society. Bai Juyi's poems not only occupied an important position in the history of Chinese literature, but also became a bridge of cultural exchange and an important literary heritage in Japan, Korea and other Asian countries.