Wei and Jin Dynasties is the most important period for the formation of regular script. During this period, Zhong You and Wang Xizhi were influential calligraphers. They combine the founder, beauty and simplicity of ancient Li, making regular script constantly perfect, creating a dignified and neat regular script style, and turning a new page in the history of calligraphy in China. Therefore, Kang Youwei said in "Two Ships in a Week": "What happened to the change of real books between Wei and Jin Dynasties? There was no real calligraphy before the Han Dynasty. The spread of real books in today's world began with Ge Fujun in the world and Li Jue, Rong Di, Xuan Shi and Ji Zhi in Zhong You, and changed completely in the two kings. It has become a Dafa so far, and it is not easy. "
The Tang Dynasty was the heyday of the development of regular script. Regular script in the Tang Dynasty is a combination of regular script in Wei, Jin, Southern and Northern Dynasties, which has formed a style of solemn font, steady and dignified strokes, rigorous structure and strict statutes. There are many regular script writers in the Tang Dynasty, including Shi Nan, Ou Yangxun, Chu Suiliang and Xue Qi in the early Tang Dynasty, and Yan Zhenqing and Liu Gongquan in the middle and late Tang Dynasty. Their regular script has both inheritance and innovation, which has a great influence on later generations. Today, people still learn regular script with Tang Kai as a model, because Tang Kai's brushwork is clear from beginning to end, with a fairly uniform structure and a square shape, which should follow the rules.
Regular script is horizontal and vertical, with compact structure, smooth momentum and beautiful shape. Generally speaking, regular script is rectangular, its structure is closer than official script, and its pen is rich and delicate. It retains the structure of official script, removes the waves of official script, changes the plane shape of official script into a basic rectangle, and forms the external beauty of regular script and the internal beauty of modality. Later, people often called Chinese characters "square characters", which was aimed at Uncle Kai. Because it is more flexible and convenient than official script writing, regular script has replaced the orthodox position of official script since its birth. Long-term practice has proved that it is a kind of calligraphy with good combination of practicality and artistry. For thousands of years, it has been an official font and a great work in the history of calligraphy.