Regular script, also known as true script and official script, is named after being neat and standardized. It comes from the simplicity and regularity of official script, and is also called "official script" and "new official script". It was formed at the end of the Eastern Han Dynasty, and became a popular official font in the Wei, Jin, southern and Northern Dynasties, and reached perfection and prosperity in the Tang Dynasty. The style of regular script is changeable, which can be distinguished from the size of the font, including big, middle and small regular script; from the style of the times, it can be roughly divided into "Wei Bei" and "Tang Kai"; from the personal style of famous scholars, it can be divided into "European style", "Yan style" and "Liu style".