Human beings first had writing, and then the art of calligraphy. From oracle bone inscriptions to bell and tripod inscriptions, and then to stone drum inscriptions, ancient Chinese writing has experienced a process from complex to simple, from concrete to abstract, and the art of calligraphy has gradually emerged. A unique art. People generally divide calligraphy into five categories according to the form of writing: regular script, cursive script, official script, seal script and running script. The official book. It is also called "regular script" and "real script". Its characteristics are: square shape and straight strokes, which can be used as a model, hence the name. It began in the Eastern Han Dynasty. There are many famous masters of regular script, such as "Ou Ti" (Ouyang Xun), "Yu Ti" (Yu Shinan), "Yan Ti" (Yan Zhenqing), "Liu Ti" (Liu Gongquan), "Zhao Ti" (Zhao Meng), etc. Cursive writing. A font created for the convenience of writing. It started in the early Han Dynasty. What was commonly used at that time was "Cao Li", which was a scrawled official script. Later, it gradually developed and formed a kind of "Zhangcao" with artistic value. At the end of the Han Dynasty, Zhang Zhi changed "Zhangcao" into "Jincao", and the style of the characters was formed in one stroke. In the Tang Dynasty, Zhang Xu and Huai Su developed "Kuaicao" with continuous and convoluted writing styles and numerous changes in glyphs. Official script. Also called "official script" and "ancient book". It is a font based on seal script and produced to meet the needs of convenient writing. Simplify the small seal script and change the evenly rounded lines of the small seal script into straight and square strokes, making it easier to write. It is divided into "Qin Li" (also called "Ancient Li") and "Han Li" (also called "Jin Li"). The emergence of official script was a major change in ancient writing and calligraphy. Seal script. It is the collective name for large seal script and small seal script. Large seal script, nail bone inscriptions, bronze inscriptions, Zhou inscriptions, and Six Kingdoms inscriptions all preserve the obvious characteristics of ancient hieroglyphics. Small seal script, also known as "Qin seal script", is the common character of the Qin Dynasty and a simplified font of the larger seal script. It is characterized by a round and neat shape, and the font is easier to write than Zhenwen. In the history of the development of Chinese characters, it is the transition between Dazhuan, Li and Kaiwen. Running script. A font between regular script and cursive script. It was created to make up for the slow writing speed of regular script and the difficulty of legibility of cursive script. The writing style is not as sloppy as cursive script, nor is it required to be as straight as regular script. Those with more regular scripts than cursive scripts are called "Xing Kai", and those with more cursive scripts than regular scripts are called "Xing Cao". Running script began in the late Han Dynasty. Large seal script, small seal script, official script, cursive script, and running script are several important stages in the development of Chinese characters. However, as an art of calligraphy, it has been preserved and formed many schools, with many famous artists and rich and colorful art treasures.