What are the main characteristics of calligraphy in Han Dynasty?

Calligraphy in Han Dynasty is mainly official script. There is a very important point in the history of China culture and calligraphy. The "official transformation" of Chinese characters ended the stage of ancient Chinese characters, and the characters after the official transformation were close to those used now.

The development of calligraphy in Han Dynasty has gone through several periods. At first, the Han dynasty inherited the Qin system and used seal script as the earliest. Later, seal script declined, official script flourished and reached its peak in the Eastern Han Dynasty. The appearance of official script is a major revolution in the history of calligraphy, which not only makes Chinese characters tend to be square, but also breaks through the single-center pen in brushwork.