Sun Yirang (September 16, 1848 - June 20, 1908) was a Chinese classics master, patriot and famous educator in the late Qing Dynasty. His young name is Xiaozhu, also known as Dehan, with the courtesy name Zhongrong and alias Zhenzhu, and he is from Ruian, Zhejiang. Together with Yu Yue and Huang Yizhou, they are collectively known as the Three Masters of the Late Qing Dynasty. He has the reputation of "the apse of Confucian classics in the late Qing Dynasty" and "the master of Pu Xue". Zhang Taiyan called him "an unparalleled double in three hundred years". 1 In the sixth year of Tongzhi's reign, he failed in the Wuying examination. The head of the Ministry of Officials and Punishments never came back. He specialized in academics and studied ancient studies intensively for forty years. He integrated old theories, edited and annotated ancient books, and wrote more than thirty kinds of books. "Zhou Li Zhengyi" was written after a lifetime of mental exhaustion, and it is an outstanding work among the new collections of classics in the Qing Dynasty. "Mozi's Interpretations" is also an authoritative work of ink-injection. "Examples of Deeds" is the pioneer work in the study of oracle bone inscriptions. "Wenzhou Jingji Zhi" is known as "the ancestor of the art and literature of Hui Zhi County in modern times". "Sikuquanshu Condensed Catalog Commentary" in twenty volumes and "Sibu Bilu" in two volumes are monographs on bibliography.