Liu Gongquan was a calligrapher in the late Tang Dynasty, and his calligraphy was very famous at that time. The Book of the Old Tang Dynasty called his book "The Diamond Sutra Monument of Shangdu Ximing Temple, with the style of Zhong (Zhi), Wang (Ou () Heather and Lu (Cambodia)" and called his calligraphy "graceful and unique". It can be seen that his calligraphy was influenced by the calligraphy school of the two kings in the early days, and then he became a family. Song Jiangkui's "Continued Book Spectrum" said: "The brushwork is different from that of the ancients, and commenting on the two schools is one of the changes in calligraphy. "This shows that Yan and Liu are different from the two kings school in history in combination and brushwork, and they have changed and innovated. Compared with Yan Shu, Liu Shu's lateral structure is a little odd, with her right shoulder upturned and her left tight and right comfortable, but it is not obvious and generally balanced. In the structure, the palace (referring to the central part of the stroke) is tight, the limbs are stretched, and the upper, lower, left and right points extend outward, while the center, that is, the stable part supporting the center of gravity of the word, is extremely tight. The brushwork adopts Fiona Fang's combination, and the horizontal painting turns into horizontal painting. When the pen is closed, it is pressed after a pause, which has the tendency of swallowtail. The pen is thick, and the vertical painting of Box 2 is slightly bent due to the influence of Yan characters. Except for some horizontal strokes and long strokes, other strokes are relatively symmetrical.
Generally speaking, Liu characters are influenced by Yan characters, but they are not as thick as Yan characters. It is stronger and more vigorous than the word Yan, giving people a close aesthetic feeling and embodying the spirit of the so-called "six valleys". Liu Shu writes vigorously, horizontally, vertically, hooked, skimmed and pressed, and has his own set of procedures for entering, turning and receiving pens. There are more than ten kinds of inscriptions on his regular script, including the Diamond Sutra unearthed in Dunhuang in his early years and now circulating in France, and his later works include Mysterious Tower and Shence Army Monument. These inscriptions can best reflect the characteristics of Liu Shu and are the best models for learning from Liu Shu.