Huai Su's cursive script is thin and vigorous, flying naturally, like a whirlwind of showers. Calligraphy is ever-changing, ever-changing and has statutes. Professor Peking University and pioneer Li Zhimin commented: "Huai Su's cursive script has a delicate and graceful god in the escape and an innocent spirit in the wild."
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Huai Su always liked calligraphy, especially cursive script, and studied very hard. It is said that because I was too poor to buy paper, I made a lacquer plate and a lacquer board to practice calligraphy. He rubbed and rubbed, and as a result, he wrote through board by board. He used countless pens and buried them at the foot of the mountain, and wrote the word "pen tomb" on them as a souvenir.
Some people say that Huai Su's and Zhang Xu's cursive scripts are impeccable top-level calligraphy works with free and easy style, but their free brushwork reveals a rigorous layout. Depend on it, let it go, expect it, and have no intention to do it. The brushwork is like flowing water, with continuous volume, natural and unrestrained spirit and vigorous and unrestrained.