What is the origin of official script?

Li Shu, including Qin Li and Han Li, is generally considered to be developed from seal script, with wide and flat font, long horizontal painting and short vertical painting, and paying attention to "silkworm head and goose tail" and "twists and turns". According to the unearthed bamboo slips, Lishu originated in the Warring States Period. According to legend, Cheng Miao was a servant shooter, which reached its peak in the Eastern Han Dynasty and had a great influence on later calligraphy. Calligraphy is known as "Han Li Tang Kai". In the process of "writing in the same language", Qin Shihuang ordered Li Si to create Xiao Zhuan, and later adopted the official script compiled by Cheng Miao. After Xu Shen recorded Ying Zheng's unified writing in Shuo Wen Jie Zi in the Han Dynasty, the history of traditional writing was revived and excavated in the Han Dynasty: "... Qin burned scriptures, washed away the old, officers and men made outstanding contributions, promoted military defense, and had numerous official and prison posts. At first, it was an official script, which was easy to be teased, and the ancient prose was lost. " "Professor Peking University and calligrapher Li Zhimin thought that Qin Shihuang's unification of the six languages was of positive significance to the social progress at that time, but it was not necessarily conducive to the development of calligraphy art. When filial piety was proclaimed, Cang Xie readers were called and Zhang Chang accepted it. Liangzhou secretariat Du Ye, Pei Ren and lecturer Qin Jin can also talk. When Emperor Xiaoping was filial, there were more than a hundred people waiting for him, so that Zi was not in the central court, and Li was regarded as a scholar. Yang Xiong, assistant minister of Huangmen, adopted it as "Xun Debate". Cang Xie's following 14 articles, with a total of 5,340 words, are all included in the group books, except for a little reservation ... The county and country often have mountains and rivers, and their inscriptions are ancient texts of the previous generation, all of which are self-similar. Although I have seen the distant past again, I can get a brief description of its details ... those who wrote these words ... the predecessors have fallen behind and the descendants have learned the ancient times. So the foundation is innate. Know the world without chaos. "But some people think that Xiao Zhuan's writing speed as an official script is slow, and the official script becomes a square fold, which improves the writing efficiency. For example, Guo Moruo used "Qin Shihuang's greater achievement in reforming Chinese characters is that he adopted official script" to evaluate its importance (the dialectical development of ancient Chinese characters in the slavery era).