Wang Xizhi's calligraphy was his favorite. Emperor Taizong of the Tang Dynasty obtained the "Lanting Preface" and recommended it as the representative of Wang Xizhi's calligraphy. He once ordered Zhao Mo and others to copy several copies and give them to close relatives and ministers. Unfortunately, it was used as a burial object by Emperor Taizong of the Tang Dynasty and buried in Zhaoling. From then on, the original work has never been seen in the world, which shows that he loved it very much. Emperor Taizong of the Tang Dynasty studied Wang Xizhi's calligraphy art assiduously and had unique insights in theory. He once wrote one article each on "On the Writing Method", "On the Fingering Method" and "On the Intention of the Calligraphy", providing incisive analysis from the perspective of beginners to advanced studies. It is emphasized that "if the heart is upright and Qi is harmonious, it will be in harmony with Yuan Miao. If the mind is not upright, the words will be leaning; if the ambition is not harmonious, the words will fall down." At the same time, it also summarizes the key points of strokes such as point, stroke, Qing, vertical, Ge, ring and wave. He also believes that "words take God as the essence" and only by "thinking and God are in harmony with nature" can we achieve the state of transformation. He also wrote an essay for "Book of Jin: Biography of Wang Xizhi", which systematically summarized the art of ancient calligraphy, and focused on judging the calligraphy art of famous calligraphers such as Zhong Yao, Wang Xianzhi, Xiao Zixuan, etc., and pointed out the shortcomings of their calligraphy works. As for Wang Xizhi, he highly praised it and commented: "So after carefully studying the ancient and modern times, studying the seal script, and trying to make it perfect, Wang Yizhi (Xizhi) is the only one who can do it! Look at his point-drawing skills, the wonderful cutting, the smoke and dew. , the shape seems to be broken but still connected; the phoenix is ??like a dragon and the dragon is like a slant but is straight. You don't feel tired when you play. It’s true!” Tang Taizong’s praise of Wang Xizhi may not be fair, but because he vigorously advocated Wang’s calligraphy, a calligraphy revolution took place in the early Tang Dynasty. Ouyang Xun, Yu Shinan, Chu Suiliang, and Xue Ji, who studied under Wang’s style, stood out. He has reached a sublime realm in the art of calligraphy.