After Qin Shihuang unified the world, he implemented a series of reforms. Among them, unifying Chinese characters is a very important policy. Qin Xiaozhuan's calligraphy style inherited the inscriptions and stone inscriptions of Qin in the Eastern Zhou Dynasty, and integrated the calligraphy styles of various places. It is the first unified font in China, which is the key to change the history of books.

In 22 1 BC, Qin Shihuang unified the world, and in order to facilitate his rule, he reformed the script, and implemented the policy of "homonym" and "forbidding those who did not cooperate with Qin Wen". Qin Wen is a writing style developed on the basis of "bronze inscription" and "seal script" following the cultural tradition of the Western Zhou Dynasty, so Qin Wen is also called "Qin Zhuan", which is distinguished from "big seal script" by later generations.

Li Si is known as the originator of Xiao Zhuan. "Book Broken" said: "Painting is like a stone, and words fly, although I made it, I made it." His handed down works include Mount Tai Stone Carving, Langyatai Stone Carving, Yishan Stone Carving and Huiji Stone Carving.

After Li Si formulated the form and writing method of Xiao Zhuan, in order to promote it to the whole country, Li Si, Zhao Gao, Hu Wujing and others compiled a literacy textbook written in a standard font-Xiao Zhuan, which was well-known by Cang Xie, Ji Li and Bo Xue, and became an enlightenment textbook for children.

In addition, Xiao Zhuan was used to write imperial edicts, and stones were carved everywhere to sing praises, which made Xiao Zhuan widely circulated.

On the basis of seal script, the characteristics of Xiao Zhuan in Qin Dynasty are to create and unify national characters by deleting complicated characters and abolishing variant characters. This kind of book is relatively simple, with horizontal lines and vertical characters. This is a great progress of Chinese characters and an important milestone in the development history of Chinese characters. It opened up a broad road for the changes of later books such as Kai, Li, Xing and Cao. Some of them are cast on iron, and some are carved on stone tablets and stone tablets. Judging from the actual materials seen so far, Qin Xiaozhan is generally carved on iron, weights and measures, seals, coins and imperial edicts. There are big and small, natural laws, dignified words and neat branches, which are the essence and representative of Xiao Zhuan.