According to the content, the preface can be divided into the following categories: (1) house number chapter (2) elegant interest chapter (3) year number chapter (4) Hao Yuezhang.
The seal of fasting in the world began with the imperial seal of Li Biduan's bedroom in the Tang Dynasty. After the Song and Yuan Dynasties, this trend became more and more popular, and almost everyone in calligraphers had the seal of fasting. Wen Zhiming, a calligrapher in the Ming Dynasty, said, "Many of my bookstores are printed." Zhai Hao is usually called Zhai, Tang, Shi, Lou, Ge, Guan, Xuan, An and so on. , such as Zhai, Tang, Shi, Lou, Ting, Lai Qin Ting, Yu Shang Xuan, An Le Tian and so on.