Huai Su: Huai Su cursive script is thin and vigorous, flying naturally, like a whirlwind of showers. Although his calligraphy is capricious and ever-changing, it has statutes. Huai Su and Zhang Xu formed two peaks of calligraphy in the Tang Dynasty, which were also two unattainable peaks in the history of cursive writing in China. Mi Fei's "Haiyue Book Review": "Huai Su is like a strong man wielding a sword, and his spirit is moving, but he advances and retreats in a roundabout way." Many poets in the Tang Dynasty praised it, such as Li Bai's cursive music and Huai Su's master Manji's cursive music.
Zhang Zhi: He was good at Cao Zhang. Later, he got rid of his old habits and preserved Cao Zhang's brushwork, which became a "modern grass". The "Shu Duan" said that he "learned the methods of Cui (Xuan) and Du (Cao), so it was a surprise to change it to this grass. The font is made in one stroke, occasionally interrupted, but the veins are continuous and even connected. " Dan Wei, a calligrapher of the Three Kingdoms, called him "the sage of grass". Jin Wang's book only praised Zhong (Yao) and Zhang (Zhi) for Han and Wei calligraphy, but thought the rest were not satisfactory. It had a profound influence on the cursive scripts of Wang Xizhi and Wang Xianzhi.