There are two reasons for the origin of "the best running script in the world". First, from the perspective of calligraphy itself, in the Jin Dynasty, due to the influence of the gentry's advocating Huang Lao and talking freely, the style of calligraphy gradually changed to pay more attention to brushwork and charm; Judging from the characteristics of running script, it is more in line with the character of Wei and Jin Dynasties. Therefore, the running script is the most prosperous calligraphy in the Jin Dynasty, which is also the highest achievement in China's calligraphy history. However, only the copy exists now, but its whole text is light and ethereal, chic and natural, without traces of carving, and it is natural and natural. Moreover, the most praised by future generations is that all the same words are written in different ways: for example, Each has its own changes. In particular, the word "zhi" has changed into more than twenty different brushstrokes, which is indeed the highest realm of Wang Xizhi's calligraphy art. Moreover, Preface to Lanting Collection is also a beautiful prose, which was passed down as Wang Xizhi's drunken work at that time. After waking up, Wang wrote many more, but none of them had the charm of the first one. Secondly, from a historical perspective, Wang Xizhi's calligraphy has been more and more popular since the Southern Dynasties. Li Shimin, Emperor Taizong of the Tang Dynasty, liked this word best, and even made the ministers of the DPRK learn it at that time, which made the book prosperous. Unfortunately, the original work was later buried in Zhaoling, and its whereabouts were unknown since then. To sum up, the running script is a font between regular script and cursive script, and Wang Xizhi's true grass was praised by Emperor Taizong (the real style refers to the transitional regular script from Han and Wei Dynasties to Sui and Tang Dynasties, characterized by official script in the script).