In the book "Book Break" by Zhang Huaiguan of the Tang Dynasty, he commented on Cai Yong's calligraphy works as: "The style of calligraphy is ever-changing, and the spirit is exhausted, and it is unparalleled in ancient and modern times." During the reign of Emperor Ling of the Han Dynasty, when Cai Yong was compiling the text of the Six Classics, he found that there were many typos in it in order not to mislead later scholars. Cai Yong reported to Emperor Ling of the Ming and Han Dynasties, hoping to correct these scriptures. Emperor Ling of the Han Dynasty agreed to Cai Yong's request. Later, Cai Yong wrote the inscription on the stele himself and then hired craftsmen to carve the words on the stele. After the engraving was completed, there were 46 stone tablets. They were all erected outside the Taixue Gate and were called the "Hongdu Stone Scripture". While admiring the stone scriptures, later generations also appreciated Cai Yong's calligraphy art. Cai Yong's official script and seal script are square and beautiful, with rigorous font structure. In addition, Cai Yong's calligraphy has various forms. The tail and beginning of the font focus on pitching writing, giving people a heavy feeling.
Speaking of Cai Yong's calligraphy works, we have to mention Cai Yong's own "Fei Bai Shu". The craftsman inspired Cai Yong when he was writing on the wall, and then Cai Yong created "Fei Bai Ti". Cai Yong's Feibai calligraphy leaves a little white space in the strokes, which adds to the elegant and ethereal feeling. In order to make the font more beautiful, Cai Yong pays attention to the posture of writing. Cai Yong's calligraphy works not only have the beauty of strength, but also add a sense of elegance, so Cai Yong's calligraphy works have high appreciation value.