The highest social ideal that China ancient Confucian legends and yearns for is Datong society. The theory of "great harmony" comes from the Book of Rites. The original text is as follows: "The trip to the Avenue is also a trip to the world, and the world is fair, selecting talents and cultivating trust. An old friend is not only a relative, but also an only child. In this way, the old will have an end, the young will be useful, and the young will be strong. Those who are sorry, widowed, lonely, widowed and disabled will be provided for, and the men will be divided and the women will return. If the goods are abandoned on the ground, there is no need to hide them on yourself; You don't have to do it for yourself. Therefore, it is called "Datong" to seek closure but not prosperity, and thieves do not do it, so leaving the house is not sealed. ? "Several signs of a great society: (1) Everyone can get the care of the whole society. That is, "not just relatives, not just sons and sons", "to be old, to be strong and useful, and to be young and strong", "the lonely, the lonely and the disabled have a support". (2) Everyone can live and work in peace and contentment. That is, "men have points and women have returns." (3) make the best use of everything and make the best use of people. That is, "the goods are abandoned on the ground and don't have to be hidden in yourself."