Sun (about 648-703 AD) was famous for his piety, courtesy and righteousness. Sun dabbled in kai, xing and Cao, especially in cursive script, and once wrote a book "Pu", which was valued by calligraphers in past dynasties. Sun's calligraphy mainly comes from Wang Xizhi. Mi Fei of the Song Dynasty once said:
Sun (648-703), born in Jiangsu. He once joined the army, led government clerks, and also led government clerks to join the army. Chen Ziang's epitaph says that he was brilliant and ambitious, but his life was not very successful. Mi Fei in the Song Dynasty believed that "every grass in the Tang Dynasty has two royal laws, which are second to none". Sun's three fonts,,, are especially good at cursive script. In the Tang Dynasty, Wu Zetian hung on the arch for three years (687), and wrote Shu Pu. The Book Score is a book rich in articles by calligraphy theory. His ink is a masterpiece of Sun's calligraphy. The preface to the book spectrum, also known as the theory of clouds and pens, is only a preface based on the inscriptions of the Song Dynasty. The content is divided into six parts: tracing the source, arguing the style of the book, commenting on the name, describing the brushwork, admonishing the scholar and hurting the confidant. The calligraphy methods of Zheng Zi and Cao Zi expounded in this paper are profound, concise and insightful. There are many arguments in the book, which are appreciated by scholars so far. Sun's Book Score occupies an important position in the history of ancient calligraphy theory in China. For example, the three stages of learning calligraphy in the book and the combination of five good and five in creation. , is still praised by scholars.