The official script can be divided into three parts: middle part, upper part, left part, right part and horizontal part. The middle point is written like this: after writing, raise the pen to the front, turn the pen back to the right, pause the pen, and then turn the pen back to the front in the point. The difference between official script and seal script lies in the biased change.
The writing of the upper point is slightly the same as that of the middle point, except that the last stroke did not close the front in the point, but wanted to gradually raise the front downward. The left and right points and horizontal points are written in the same way as the above points, but the starting position is different from the front direction.
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, official script originated in Qin Dynasty, and Cheng Miao was also called official script. Han Li reached its peak in the Eastern Han Dynasty, inherited the tradition of seal script, and opened the Wei, Jin, Southern and Northern Dynasties, which had a great influence on later calligraphy. The calligraphy circle called it "Tang Kai of Han Li".