Since the Han Dynasty, the "Nine Clans" have two interpretations of Confucian Classics: modern and ancient, each with its own social and political background, which met the needs of the rulers from different aspects. 1, ancient prose theory. Representative figures are Kong Anguo, Ma Rong and Zheng Xuan. They believe that the nine clans are limited to paternal clans, including nine generations of immediate family members from Gaozu to Great-great-grandson. The theory of ancient Chinese prose constitutes the basis of patriarchal ethics. After the Tang and Song Dynasties, the ancient prose theory of the Nine Clans was formally confirmed in the national law, among which the Ming and Qing laws stipulated that the Nine Clans specifically referred to the paternal clan. The second chapter of the third volume of Morgan's "Ancient Society" also quoted the nine theories of ancient Chinese prose. "Book Essentials": "Ke Ming Jun De, to kiss nine families." Kong Chuan: "Be close to great-great-grandfather and great-grandson." Preface to "Feng Wang Gree": "Zhou Shi's Taoism declined and abandoned the nine families." Zheng Xuan wrote: "Nine families, hydrogen has reached the relatives of great-grandfather and great-grandson." Refer to the figure of thirty-five clothes in Yuan Volume, the figure of one hundred and two mourning clothes in Ming Volume, the figure of five clothes in nine ethnic groups, and the figure of mourning clothes in nine ethnic groups in Qing Law Volume. 2. This article says. Representative figures include Xu Shen and others. They think that the nine clans include father clan 4, mother clan 3 and wife clan 2. This theory met the needs of feudal rulers to achieve maximum control over their own class and the whole society by kinship. When the feudal rulers rewarded and punished the slaughter, they made use of nine modern works. The history of Emperor Gaudi of Han Dynasty says, "Put Zong Zheng in the order of the nine clans." Tang Wang Changling's poem "Ya": "Nine clans are separated by Chu prisoners, and deep streams are lonely and lonely." Yuan Ming's "Earn Express" is the fourth fold: "There is a saying in the law:' If one person rebelled, all nine families would be punished." "Refer to Sun Xingyan's Shu Shang Jin Wen Gu Shu.