Chinese Calligraphy

Grass Script: The Dance of the Brush (草书)

Q: What is the difference between Zhang Cao and Jin Cao?

Zhang Cao (章草, 'draft grass') is the older, more restrained form that developed in the Han dynasty. Each character is written with a flowing yet separate structure, with distinct brush pauses between characters. Jin Cao (今草, 'modern grass'), pioneered by Wang Xizhi in the Eastern Jin, links characters together in continuous cursive chains, allowing much faster and more expressive writing. Within Jin Cao, the extreme form Kuang Cao (狂草, 'wild grass') emerged, pushing abbreviation and momentum to their limits.

Q: Why is it called 'grass' script?

The name 'grass script' (草书, cǎo shū) likely derives from the Chinese term 'cao gao' (草稿, 'draft manuscript'), as the style was originally used for hasty, informal drafting. The character 草 (cǎo) also means 'grass,' which later gave rise to the poetic image of the script swaying like windblown grass. A more romantic explanation suggests the flowing strokes resemble wild grass bending in the breeze, but the original meaning was simply 'draft' or 'rough script' used for speed.

✍️ by xiaoyu luo 🗓️ Updated Jul 29, 2026 Last updated: July 2026 · Reading time: 8 min

Among the five major scripts of Chinese calligraphy, none inspires as much awe — and confusion — as Grass Script, or cao shu (草书, cǎo shū). At first glance it looks like a tangle of ink: characters abbreviated to a few wild loops, strokes bleeding into one another, and lines that swoop across the page as if the brush has taken on a life of its own. But beneath this apparent chaos lies one of the most disciplined and technically demanding art forms in Chinese culture. Grass Script is not merely fast writing — it is the highest expression of the calligrapher's inner spirit, a visual record of breath, rhythm, and emotion captured in ink.

The Birth of Grass Script in the Han Dynasty

The origins of Grass Script lie in practical necessity. During the Han dynasty (汉朝, Hàn Cháo, 206 BCE–220 CE), the imperial bureaucracy expanded enormously, and scribes needed to draft documents faster than the laborious Seal Script (篆书, zhuàn shū) or even the clerical li shu (隶书, lì shū) allowed. They began to abbreviate characters, merging strokes and reducing the number of brush lifts. This early form is known as Zhang Cao (章草, zhāng cǎo) or "draft grass," and it still kept each character separate while simplifying their internal structure.

The earliest surviving examples of Zhang Cao appear on wooden slips and silk manuscripts excavated from Han tombs. The great Han-dynasty calligrapher Zhang Zhi (张芝, Zhāng Zhī, d. 192 CE) is traditionally honored as the "Sage of Grass Script" (草圣, cǎo shèng), although almost all of his original works have been lost. His nickname — "the Abandoned" — came from the story that he spent so much time practicing on bolts of silk that the fabric turned black, and he would then dye the silk and wear it. By the late Han, Zhang Cao had become a recognized calligraphic script with its own standards, no longer just a scribble but a deliberate art.

The Eastern Jin dynasty (东晋, Dōng Jìn, 317–420 CE) brought the decisive breakthrough. Wang Xizhi (王羲之, Wáng Xīzhī, 303–361 CE), the Sage of Calligraphy, transformed Grass Script by inventing Jin Cao (今草, jīn cǎo) or "modern grass." Where Zhang Cao kept characters separate, Jin Cao connected them end to end in a cursive stream, weaving whole phrases into a single unbroken movement of the brush. Wang Xizhi's masterpiece in this vein, the "Seventeen Ties" (十七帖, Shí Qī Tiē), is a series of letters written in flowing Jin Cao that became the canonical model for grass-script study.

Kuang Cao: The Wild Masters of the Tang

If the Jin dynasty gave Grass Script its connective logic, the Tang dynasty (唐朝, Táng Cháo, 618–907 CE) gave it its wild heart. The most extreme form of the script, Kuang Cao (狂草, kuáng cǎo) or "wild grass," was developed by two legendary figures: Zhang Xu (张旭, Zhāng Xù, c. 658–747) and Huai Su (怀素, Huái Sù, 737–799). Their style pushed abbreviation, speed, and emotional intensity to a level never seen before or since.

Zhang Xu was known for his eccentric behavior: he would drink heavily — sometimes a whole jar of wine — and then, in a drunken frenzy, seize the brush and dash characters across the wall, the floor, or even his own clothes. He once dipped his long hair into the ink basin and used it as a brush, swinging his head to create sweeping diagonal strokes. The Tang emperor himself ordered Zhang Xu to write the "Regulations for the Court" in the imperial palace, acknowledging that only this madman's brush could capture the majesty of the law. Zhang Xu's surviving work, "Four Ancient Poems" (古诗四帖, Gǔ Shī Sì Tiē), shows characters twisting and coiling like dragons in a storm cloud.

Huai Su, by contrast, was a Buddhist monk who practiced with such ferocious dedication that he wore a hole through the temple floor with his pacing. He planted banana trees around his monastery and used their broad leaves as practice paper when he could not afford silk. Huai Su's "Autobiographical Essay" (自叙帖, Zì Xù Tiē), written in 777 CE, is the definitive masterpiece of Kuang Cao — twelve feet of silk covered with characters that swell, contract, and careen across the page in a display of controlled frenzy. Tang critics said his calligraphy was like "a sudden gale and a galloping horse" (骤雨旋风, zhòu yǔ xuàn fēng).

Technique and Principles

Writing Grass Script requires mastery of the brush tip that goes far beyond the other scripts. The practitioner must internalize hundreds of standard abbreviations — most characters in cao shu are reduced to a skeleton of two or three strokes, but each abbreviation follows a fixed convention documented in reference books such as the "Cao Shu Bian" (草书辨, "Identification of Grass Script"). There is no room for guesswork; a stroke misplaced by a millimeter changes the character entirely.

The brushwork relies on three essential techniques. The first is zhuan bi (转笔, "turning the brush"), where the calligrapher rotates the brush shaft between the fingers during a single stroke to vary width and direction without lifting. The second is jiao bi (绞笔, "twisting the brush"), a corkscrew motion that creates kinked, textured lines full of tension. The third is ti bi (提笔, "lifting the brush"), a rapid flick that tapers the stroke to a fine, elastic tail. These techniques demand extraordinary wrist control; a beginner's grass script often looks merely messy, while a master's flows with the inevitability of water running downhill.

Rhythm is everything in cao shu. The speed of the brush is not constant — it accelerates through straight passages, decelerates at turns, and pauses imperceptibly at the "breath points" (气口, qì kǒu) where the character's energy gathers before releasing. Good grass script calligraphy is often compared to a musical performance: the viewer should be able to feel the calligrapher's heartbeat in the alternation of fast and slow strokes.

Grass Script and Chinese Aesthetics

Grass Script occupies a unique position in Chinese art because it bridges calligraphy and abstract painting. The same ink, the same brush, the same paper — but where kai shu (楷书, kǎi shū) prizes legibility and structure, cao shu prizes expression and movement. The early Qing dynasty scholar Fu Shan (傅山, Fù Shān, 1607–1684) famously declared that for calligraphy, "clumsiness is better than skillfulness, awkwardness is better than smoothness, and wildness is better than refinement" — a slogan that could serve as the manifesto of Grass Script.

This aesthetic of controlled wildness is deeply connected to Daoist and Chan Buddhist philosophy. The Daoist concept of ziran (自然, "naturalness" or "spontaneity") finds its perfect expression in the unrepeatable flow of grass-script strokes. The Chan (Zen) ideal of sudden enlightenment — of breaking through conceptual thought to direct experience — echoes in the calligrapher's rejection of premeditation in favor of instantaneous, full-bodied response. A great grass-script work is not planned; it is channeled. Mao's grass script, written in his bold, sweeping hand, appeared on government documents, poems, and public inscriptions throughout the 1950s and 1960s, introducing millions of ordinary Chinese to the beauty of the script. Lin Sanzhi, honored as the "Sage of Grass Script of the 20th Century," achieved a remarkably ethereal style characterized by pale, dry brush strokes and subtle ink washes that seem to float above the paper. Today, cao shu remains the supreme test of the calligrapher's art — the script where technique dissolves into pure spirit.

❓ Frequently Asked Questions

Q: What is the difference between Zhang Cao and Jin Cao?

A: Zhang Cao (章草, "draft grass") is the older, more restrained form that developed in the Han dynasty. Each character is written with a flowing yet separate structure, with distinct brush pauses between characters. Jin Cao (今草, "modern grass"), pioneered by Wang Xizhi in the Eastern Jin, links characters together in continuous cursive chains, allowing much faster and more expressive writing. Within Jin Cao, the extreme form Kuang Cao (狂草, "wild grass") emerged, pushing abbreviation and momentum to their limits.

Q: Why is it called "grass" script?

A: The name "grass script" (草书, cǎo shū) likely derives from the Chinese term "cao gao" (草稿, "draft manuscript"), as the style was originally used for hasty, informal drafting. The character 草 (cǎo) also means "grass," which later gave rise to the poetic image of the script swaying like windblown grass. A more romantic explanation suggests the flowing strokes resemble wild grass bending in the breeze, but the original meaning was simply "draft" or "rough script" used for speed.

Q: Who was the greatest master of wild grass script?

A: Most scholars award that title to Zhang Xu (张旭, c. 658–747), nicknamed "Crazy Zhang" (张颠, Zhāng Diān). He was known to drink heavily before writing, dipping his hair into the ink and swirling characters across the wall in a trance-like frenzy. His contemporary Huai Su (怀素, 737–799), a Buddhist monk, is his only serious rival; together they are called "Crazy Zhang and Drunk Su" (颠张醉素, Diān Zhāng Zuì Sù). Their works represent the absolute peak of expressive abstraction in Chinese calligraphy.

Q: Is Grass Script still readable today?

A: Yes, by trained readers. Grass script follows a standard system of abbreviation strokes for each character — it is not random. Many of these abbreviated forms are used daily in "xing cao" (行草, running-grass), the cursive handwriting taught in Chinese schools for note-taking. However, the wilder forms of Kuang Cao require specialist training to decipher because characters may be compressed, merged, or stretched beyond recognition. A single well-executed grass-script character can convey the same meaning as its full-form equivalent in one or two strokes.

Key Terms

草书

cǎo shū — Grass Script

章草

zhāng cǎo — Draft Grass (early form)

今草

jīn cǎo — Modern Grass

狂草

kuáng cǎo — Wild Grass

Fun Facts

Zhang Xu, the "Crazy Zhang," once dipped his long hair into an ink basin and used it as a brush, writing characters on the palace wall while the Tang emperor watched in amazement.
Huai Su was so poor that he could not afford paper — he practiced grass script on banana leaves and on a wooden board so repeatedly that the brush wore a hole through the wood.
A single grass-script character for "dragon" (龙, lóng) can be written in as few as two continuous strokes, yet remain perfectly legible to a trained reader.