The writing is slightly wide and flat, the horizontal drawing is long and the vertical drawing is short, and it is rectangular, paying attention to the "silkworm head and goose tail" and "twists and turns".
Cao Quanbei is a masterpiece of official script in Han dynasty. It is famous for its elegant style and even structure. It is highly praised by calligraphers of all ages and is the "normal practice" for future generations to learn official script. Cao Quanbei's writing is clear, the structure is stretched, the font is beautiful and flying, and the calligraphy is neat and fine, beautiful and spineless, which fully shows the maturity of han li.
Since the official script, the font structure of Chinese characters has changed from lines to strokes. Learning official script can master the basic strokes of brush calligraphy and lay a solid foundation for learning regular script and cursive script in the future. The appearance of official script is a major change in the history of Chinese calligraphy. By the late Eastern Han Dynasty, official script had developed to a highly mature stage.