After Qin Shihuang unified the six countries (in the first 222 years), the unified measurement implemented the policy of "words with the same language, cars with the same track", and Prime Minister Li Si was in charge. On the basis of the original seal script used in Qin State, it simplified and created a unified writing form of Chinese characters.
Popular from the Qin Dynasty to the end of the Western Han Dynasty (about 8 AD), it was gradually replaced by official script. But because of its beautiful font and long ancient rhyme, it has always been favored by calligraphers.
Extended data
After Qin Shihuang unified the six countries, he felt that the national writing was complicated and the style of writing was different, so he put forward the idea of "the same language is not named" and unified the writing and style. Qin Shihuang asked Lisi, who was good at calligraphy, to write a ghost. Therefore, Xiao Zhuan is also called "Qin Zhuan".
Another reason is to change the original winding stroke lines and sort out a new font with even strokes and convenient writing.
The formulation of seal script is the first time in China to systematically standardize the writing of Chinese characters.