This book draws lessons from Huai Su's cursive brushwork, which is vertical and horizontal, magnificent, unique and unrestrained, especially showing the calligrapher's superb calligraphy skills. Huang Tingjian's "On Valley" said: "I have studied cursive for more than 30 years. At the beginning, I took Zhou Yue as my teacher, so I was full of customs for 20 years. Later, I got Su Caiweng and Zi Mei's views on calligraphy, which was the meaning of the ancients. " Later, Zhang Changshi, Huai Su, the eminent monk and Gao Xian all got ink marks, which shows the wonderful brushwork. After the quotation, Huang wrote a regular script, which was tight inside and loose outside. The pen is long and vigorous, full of twists and turns, and the momentum is open. A volume of calligraphy with two bodies set against each other is particularly rare, and it is a masterpiece of his later years.