Lv Simian (1884- 1957), whose real name is Cheng Zhi, was born in a scholarly family in Changzhou, Jiangsu. When I was young, my parents and teachers taught me. He entered the county school at the age of 15. In his early years, he taught in Changzhou Xishan Primary School and Changzhou Affiliated Middle School. Among the students were Qian Mu, Zhao Yuanren and others, who later became great writers of literature and history. After 1926, he taught at Guanghua University for a long time and became a professor at East China Normal University after liberation. He reads widely, pays attention to comprehensive research, and pays attention to mastery. In his life, he wrote two general histories of China, four dynastic histories and five special histories, plus a large number of historical notes which enjoyed high reputation in the history circle, totaling 10 more than ten thousand words. The history of vernacular literature, the history of pre-Qin, the history of Qin and Han dynasties, the history of southern and northern dynasties, the history of Sui, Tang and Five Dynasties, and notes on the history of reading are the most representative historical works of Mr. Lu.