Liu Gongquan (AD 778-AD 865), a famous calligrapher in the Tang Dynasty, was born in Jingzhao Huayuan (now Yaoxian County, Shaanxi Province). Official to the prince, known as "Liu". Liu Gongquan's calligraphy is famous for regular script, which is as famous as Yan Zhenqing, and is called Yan Liu. Wang Xizhi, a beginner in calligraphy, later visited famous calligraphers in the Tang Dynasty and thought that Yan Zhenqing and his calligraphy were the best, so he absorbed the strengths of Yan and Ou, and formed his own Liu style between the charm of Jin people and the graceful and unconstrained style of Yan's calligraphy, which was famous for its strength and strength, and later generations had the reputation of "Yan Gu". He wrote many works in his life, mainly including Hui Yuan's View of the Bell Tower in the Tang Dynasty, Diamond Sutra Engraving, Xuanta Monument, Su Feng Monument, Shence Army Monument and so on. In addition, there are ink marks such as "Zhao Meng Post" and "Pear Post and Postscript from Wang Xianzhi".