This poem is a history. In 8 17 (the 12th year of Xian Zongyuan), Prime Minister Pei Du led his troops to pacify Huaixi, but Li Su was the first general to break the rebel Wu Yuanji who captured Cai Zhou alive. When Xian Zong asked Han Yu to write Ping Huai Xi Bei, Han highlighted Pei Du's strategizing after carrying out the constitutional purpose, which caused great dissatisfaction. When his wife (the daughter of Princess Tang An) entered the palace and complained that the inscription was not real-time, Xian Zong ordered Duan Wenchang, a bachelor of Hanlin, to write a new article, and his views were quite different. Li Shangyin fully agrees with Han Yu's point of view. His poems strongly expressed his indignation at Han Bei's abrasion and praised this inscription more enthusiastically. This poem is basically narrative, but it is vigorous and emotional, and some famous sentences in it have been recited all the time.