For example, after Qin unified the six countries, it was inconvenient for Oracle Bone Inscriptions to write and popularize seal script. In order to make official documents circulate smoothly, Qin Shihuang promoted seal script to official script. For example, in the Tang Dynasty, tenses were relatively stable. As the so-called "prosperous time of the Tang Dynasty", people's thoughts were relatively stable and their lives were relatively comfortable. Therefore, regular script writing is more rigorous, one can't leak, one can't mess.