Liu Gongquan, Zi Chengxuan, is a famous calligrapher in Tang Dynasty, Han nationality and Beijinger. 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. Liu Gongquan is another influential calligrapher after Yan Zhenqing. He absorbed the strengths of Yan and Europe and became a family of his own. His calligraphy is vigorous and rigorous, which is known as "Yan Liu Jin Gu" with Yan Zhenqing.
Liu Gongquan's calligraphy features: vigorous structure, rigorous and meticulous use of words. Steady but not vulgar, risky but not surprising, old but not withered, moist but not fat, harmonious behavior and incomparable charm. Yan Gu means that both kinds of calligraphy are very powerful, but their styles are different. Liu Shu's brush strokes are clear and bony.