At that time, the unified writing was based on Xiao Zhuan as the official standard. And write a text model to promote to the whole country. The formulation of Xiao Zhuan is the first time that China has a system to standardize writing. It is also a turning point in the transformation of Chinese characters from ancient style to modern style.
However, the writing of Xiao Zhuan is more complicated, which requires the font to be rectangular, the strokes to be horizontal and vertical, even and round, and the thickness to be consistent. All strokes are based on a circle, starting with a circle, ending with a circle and being square in the circle. Fonts pay attention to balance and symmetry, arc strokes are symmetrical left and right, up and down, and left and right inclinations should be symmetrical. In the field of calligraphy, "Beauty of Dragon Virtue" has won everyone's love. It calls Xiao Zhuan "Wan'er Tong". Many inscriptions in later generations are engraved with Xiao Zhuan, because it has an elegant and solemn feeling.
Every circle written in seal script is round, so it will be slower to write a circle of strokes. Moreover, it is difficult to carve small seal characters on bamboo slips. Later, for the convenience of writing and carving, the rounded corners were changed into squares. Slowly, gradually evolved into another way of writing, called official script. He writes more succinctly and faster than Xiao Zhuan. And the font is more generous. Soon, scholars all over the world accepted this new font, and under the informal official form, official script gradually became popular among scholars. By the end of Qin Dynasty, official script began to gradually replace the position of Xiao Zhuan. Even the official script has accepted this new font. Finally, it became a unified way of writing. It has flourished in the Han Dynasty, in the Southern and Northern Dynasties, and still exists in the Tang Dynasty.