Liu Gongquan (778-865) was born in Jingzhao Huayuan (now Yaoxian County, Shaanxi Province). He liked studying when he was a child, and he was able to write ci at the age of twelve. Because he is good at calligraphy, he was selected by Hengli of Mu Zong, and he was called the Bachelor of Calligraphy in the Hanlin Academy. Liu Gongquan's calligraphy is most famous for regular script, which is as famous as Yan Zhenqing and is called Yan Liu. He followed the brushwork of Wei Jinxia and the early Tang Dynasty and was influenced by Yan Zhenqing. He founded his own Liu School between the charm of Jin people and the elegance of calligraphy. Its charm is vigorous, which can be compared with that of Yan Shu, and later generations have the reputation of "Yan Gu".

Liu Gongquan has many works handed down from generation to generation. The inscriptions handed down from ancient times include the Diamond Sutra, the Mysterious Tower Monument and the Su Feng Monument. Among them, the engraved version of Diamond Sutra, the mysterious pagoda monument and the Shence Army monument can best represent its regular script style. Liu Gongquan's cursive scripts include Shen Fu, Sixteenth and Insulting Xiang Tie. Their style still inherits the style of the Wangs, which is rigorous and natural. In addition, there are ink marks such as "Zhao Meng Post" and "Pear Post and Postscript from Wang Xianzhi".

"Zhao Meng Tie" is made of white linen paper and has 7 lines and 27 words. The Forbidden City is now in Tibet. His book was inscribed in Sanxi Hall, Fa Tie, and Qianlong called it "ecological danger, strength right army". The body is a little shiny, heavy and relaxed. In addition, there is a sub-thinking post in the continuation post of Lanting, with different words. Hanlin did not call it "going out to defend", so it was suspected to be false, which was drafted by a master in the late Tang Dynasty and early Song Dynasty.