Zhou Xuanwang Taishi Shuan once wrote Wen Zhuan (also known as Da Zhuan), and some forms of Wen Zhuan can also be seen in the interpretation of the text. After Qin Shihuang unified the whole country, Lisi played the same script, so Xiao Zhuan became popular. The book Shuo Wen Jie Zi is based on explaining Xiao Zhuan. After the Han Dynasty, writing became easier and easier, and official script became the common writing in the Han Dynasty. After Wei and Jin Dynasties, the font was changed to regular script, which was convenient to write and remained quite stable after transmission, and it has been used ever since. At the same time, for the convenience of writing, running script and cursive script also appeared, which are variants of regular script.