Liu Gongquan's calligraphy is famous for regular script. He studied Wang Xizhi first, and then the calligraphy of the famous Tang Dynasty. He absorbed the advantages of Yan Zhenqing and Ou Yangxun, absorbed new ideas, and created his own unique "Liu Ti" famous for its infinite strength. Later generations have Yan Liu Jin Gu, which is also called "Liu Yan Gu" with Yan Zhenqing, and "four masters of regular script" with Ou Yangxun, Yan Zhenqing and Zhao Mengfu.
Liu Gongquan is a summarizer and innovator of regular script. On the basis of learning and inheriting the regular script styles of Zhong You and Wang Xizhi, he read modern calligraphy, studied Yan Zhenqing, combined with his new ideas, and created his own unique "Liu-style" regular script, which became a model for hundreds of later generations and one of the outstanding representatives of China's law-abiding in the Tang Dynasty. His figures are well-proportioned, thin and hard, closely following Weibei, and the stippling is crisp and high, firm and tight. Compared with his face, his regular script is slightly symmetrical and slender, so it is called "Six Valley in Yanjin".
Since Tang Chaoyuan came to power, Liu Gongquan's reputation has been growing day by day. Tang Xuanzong especially cherished Liu Gongquan's calligraphy. He once called Liu Gongquan to the front of the hall. Let Simon hold the inkstone, and the fulcrum let Cui Juyuan hold the pen. Liu Gongquan wrote a cross on a piece of paper with a real book "Mrs. Wei's calligraphy" and wrote eleven words on a piece of paper with a running script "Yongchang Temple has a thousand words and a true grass family style"; He wrote eight words on a piece of paper in cursive script: "How can predicates help?" . Xuanzong gave him brocade, wine bottles, plates and other silverware. He was also asked to write a thank-you note, whether it was an original or a cursive script. At that time, the minister's family erected a monument to his ancestors.
If Liu Gongquan can't get the inscription he wrote, people will think it is an act of filial piety. In addition, Liu Gongquan's reputation has also spread abroad. When foreigners pay tribute, they specially prepare money to buy Liu Gongquan's calligraphy. Tang Wenzong once praised his calligraphy, even the regeneration of Zhong You and Wang Xizhi could not be surpassed.