The so-called "Tang people respect the law" means that the calligraphy art in the Tang Dynasty is as rigorous and upright as that in the prosperous Tang Dynasty. An unprecedented pattern appeared in the Tang Dynasty, so did yamen and calligraphy. In the Tang Dynasty, calligraphers changed the romantic atmosphere of the Jin and Wei Dynasties, standardized many lines in calligraphy structure and pen use, and the pattern was decided from then on. The research and discussion on brushwork has reached a new level, such as Ou Yangxun's thirty-six methods and eight strategies, Tang Taizong's calligraphy tactics, Yan Zhenqing's explanation of Zhang Changshi's twelve meanings of brushwork, Zhang Huaiguan's ten-stroke brushwork and Yutang's forbidden classics, etc. Therefore, both regular script and cursive script in the Tang Dynasty are proficient in this way, honest and honest, and the atmosphere is vigorous, which embodies the spirit of the Tang Dynasty empire.