In Yuan Dynasty, the Zheng family in Pujiang lived under the same roof for more than 360 years from the early Southern Song Dynasty to the third year of Ming Dynasty (1459). His deeds are recorded in History of Song Dynasty, History of Yuan Dynasty and History of Ming Dynasty. In the fourth year of Yuan Dynasty (1344), the Zheng family was named "Filial Piety" for the first time, which was commended by the Yuan and Ming Dynasties for many times. In the 18th year of Hongwu in Ming Dynasty (1385), Zhu Yuanzhang named it "Jiangnan * Family". Known as "Yimen Zheng", also known as "Zhengyimen". With the reputation of being studious and filial, Zheng Yimen had about 173 officials from the Song and Yuan Dynasties to the Ming and Qing Dynasties, especially in the Ming Dynasty, there were 47 officials, whose official positions * were in the history of the Ministry of Rites. Surprisingly, among Zheng's descendants, no one was dismissed for being greedy for ink. There are many reasons why the Zheng family in Pujiang has lived in groups for hundreds of years, among which the Zheng code is the core, spiritual pillar and family law foundation to maintain the family's survival. Zheng's code is detailed, with 168 rules, which have been revised and supplemented by three generations. As an outstanding representative of feudal family law norms in China, Zheng Jiafa norms reflect the overall style of family training culture in the Song, Yuan and Ming Dynasties, and have high research value. Today, many contents still have reference significance. The core meaning of Zheng Family Law mainly includes three aspects, namely, respecting ancestors and filial piety, cultivating self-cultivation, valuing righteousness over profit, advocating honesty and refraining from extravagance and doing good. The content involves the daily life of family members, domestic management, education of children and grandchildren, behavior and other specific aspects. Understanding and studying the ethics of the Zheng family can provide reference for parents to educate their children; The Zheng family in Pujiang is an official, but none of them is greedy for ink, which can be cited as a textbook for clean government education. This book takes the original version of Zheng's code recorded in Lei Bian as the base, and presents the family rules of Zheng's family to readers in the form of linear vertical arrangement of rice paper.