In fact, it is the same as other calligraphy styles. It was originally founded as a general mass writer. As long as it is written in other calligraphy, it becomes a running script without official style. It can be seen everywhere in bamboo slips unearthed at the end of Han Dynasty. At the end of Han dynasty, running script was not widely used. It was not until the appearance of Wang Xizhi in Jin Dynasty that it became popular.
Running script is a writing style between regular script and cursive script. Write more freely and smoothly, and those close to cursive script are called cursive script; The writing is relatively correct and stable, close to the standard of regular script.