2. The change of calligraphy font was not only carried out in Wei and Jin Dynasties. After Qin Lisi unified the font for Xiao Zhuan, the commonly used font was Miao Zhuan, which is a kind of square seal different from Xiao Zhuan. Later, due to the need of writing, fonts were separated from the tortuous seal script and gradually replaced by the tortuous official script, and the time entered the Han Dynasty. In the Jin Dynasty, due to the melee among countries, the writing efficiency needed to be improved, and the tortuous pen gradually disappeared. In the south, Wang Xizhi turned it into a nearly modern regular script, and in the north, it merged the uninhibited personality of the Hu people, and the font became a mighty Wei Bei. After the unification of Sui Dynasty, regular script in Tang Dynasty reached its peak, and various styles of Tang Kai appeared. The evolution of Chinese characters ends here.