Yan Zhenqing's calligraphy is exquisite and good at it. Chu Suiliang, a beginner, studied under Zhang Xu and got his brushwork. Its regular script is dignified and majestic, and its running script is vigorous and powerful, which has created a "Yan style" regular script and has a great influence on later generations. Together with Zhao Meng, Liu Gongquan and Ou Yangxun, they are also called "four masters of regular script". Together with Liu Gongquan, they are called "Yan Liu" and "Yangu". He is also good at poetry, such as You, Ji, Wu, Ji, Lu Ji and Linchuan Ji, all of which have been lost. The Song people compiled Yan Ji.
Liu Gongquan's calligraphy is famous for regular script. He first learned from Wang Xizhi, and later visited a famous calligrapher in the Tang Dynasty. He absorbed Yan Zhenqing's strengths and new ideas, and created his own unique "Liu Ti", which was famous for its infinite strength and was later known as "Yan Gu". It is also called "Yan Liu" with Yan Zhenqing, and "four masters of regular script" with Ou Yangxun, Yan Zhenqing and Zhao Meng. Inscriptions handed down from ancient times include diamond sutra, mysterious pagoda monument, Su Feng monument, etc. Cursive scripts include Fu, Sixteen Days Post and Insulting Post. In addition, the ink "Zhao Meng Post" and "Wang Xianzhi Send Pear Post Postscript" have also been passed down from generation to generation. Liu Gongquan also works in poetry, and his poems are preserved in The Whole Tang Poetry and The Whole Tang Poetry.