The difference between cursive script and cursive script.

Cao Zhang's brush strokes are very simple, connected by twisted ribbons, similar to today's grass. However, its structure is straight, its brushwork is blunt, and there are waves in the strokes, especially at the beginning and end of the painting, which obviously retains the brushwork of the official script, and its words are independent, intermittent and orderly, which is obviously different from grass and weeds.

This kind of grass, commonly called cursive script, is based on Cao Zhang and regular script. It is made by removing the traces of official script left by Cao Zhang, speeding up the writing, and adding a hook. Zhang Huaiguan's "Broken Book" said: "The book of Cao Zhang has different characters, and Zhang Zhi has turned it into a modern grass, increasing its flow rate, plucking its hair, linking it up and down, or borrowing the suffix as the next prefix, which is odd-shaped, and has both numbers and meanings." This is a summary of the different postures and brushwork of Cao Zhang and Cao Jin, such as Cui Yuan's "Fairy Post".

Weeds was founded in the Tang Dynasty, and Zhang Xu was the founder of Weeds, so he was called "the sage of grass". Huai Su, a later monk, was also a master of weeds. Weeds are simpler and faster than today's grass, and their brushwork is more continuous and tortuous, lively and dancing, unrestrained and galloping thousands of miles. The ancients said that its shape was "folded and hugged, swayed and hung, neat and tidy, uneven, held high in the shade, or worn selectively." It's really "various, endless, not surprising." The author can use it to express his bold and exciting feelings, or to express his ambition, or to dispel the stagnant mood. However, because it omits many strokes, and the shape is too different from letters and lines, it is difficult to identify.