The regular script or standard script, or in kaishu and kaisho, also commonly known as standard regular, is the newest of the Chinese calligraphy styles, hence most common in modern writings and publications.

The latter shows 9,353 pre-Han scripts, consisting mostly of the late Qin small seal script characters and a small number of Six Warring States variant scripts, listed under 540, the lifework of Xu Shen иЁ±ж„ј, during the Han Dynasty. Not long after however, the ''Shuowen Jiezi'' иЄЄж–‡и§Је— was written preserving the canonical small seal script of late-Qin. The first known character dictionary was the 3rd century BC ''Erya'' з€ѕй›…, collated and bibliographed by Liu Xiang еЉ‰еђ‘ and his son Liu Xin еЉ‰ж†, lost the pre-Han script during the course of textual transmission. However, recent archaeological discoveries and scholarship have led some scholars to conclude that the direct ancestor of clerical script was proto-clerical script, which in turn evolved out of the little-known ''vulgar'' or ''popular'' writing of the late Warring States to Qin period. In the popular history of Chinese characters, the Small Seal script is traditionally considered to be the ancestor of the clerical script йљ·ж›ё, which in turn gave rise to all of the other scripts in use today. Their form is characterised by being less rectangular and more squarish. Through Chinese commentaries, it is known that Li Si compiled ''Cangjie'' еЂ‰й ЎзЇ‡, a non-extant work of character recognition listing some 3,300 Chinese characters in small seal script. It was systematized by Li Si жќЋж–Ї during the reign of the First Emperor of China Qin Shi Huang through elimination of most variant structures, and was imposed as the nationwide standard, but small seal script was clearly not ''invented'' at that time. This was the period of maturation of Small Seal script, also called simply ''seal script''. Beginning around the Warring States period, it became vertically elongated with a regular appearance. The script of the Qin system had evolved organically from the Zhou script starting in the Spring and Autumn period. Since the term is an imprecise one, not clearly referring to any specific historical script and not used with any consensus in meaning, modern scholars tend to avoid it, and when referring to ''seal'' script, generally mean the seal script of the Qin system, that is, the lineage which evolved in the state of Qin during the Spring and Autumn to Warring States periods and which was standardized under the First Emperor. It has also been used to refer to Western Zhou forms or even oracle bones as well. The Large Seal script was originally a later, vague Han dynasty reference to writing of the Qin system similar to but earlier than Small Seal. There are two uses of the word seal script, the, and the lesser or the latter is also called simply ''seal script''. Most people today cannot read the seal script, so it is generally not used outside the fields of seals and calligraphy. See for examples of seal script compared to modern Chinese script. The literal translation of its Chinese name зЇ†д№¦ is ''decorative engraving script'', because by the time this name was coined in the Han dynasty, its role had been reduced to decorational inscriptions rather than as the main script of the day.

Ever since, its predominant use has been in seals, hence the English name. Seal script became standardized and adopted as the formal script for all of China in the Qin dynasty, and was still widely used for decorative engraving and s in the Han dynasty. It evolved organically out of the script, arising in the of. Seal script is an ancient style of Chinese calligraphy.

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