The first dynasty when China entered a well-off society was the Xia Dynasty. As far as we know, in 2070 BC, Yu established the first dynasty in the history of China-Xia. The Confucian classic "Book of Rites Li Yun" said that before the establishment of the Xia Dynasty, it was a "world of great harmony", and after the establishment of the Xia Dynasty, it entered a "well-off world". The "Great Harmony World" is a society in which the world is public and the "Well-off World" is a society in which the world is home. The establishment of the Xia Dynasty marked the transformation from "the world is public" to "the world is home", and the hereditary system replaced the abdication system.