Abstract：On the question of the origin of society， there are four kinds of views in the two factions of anthropology，including the theory of synchronous emergence of society and human and the theory of nonsynchronous emergence of society and human.The first three views are difficult to be set up， only the fourth one which is Zhang Yan's nonsynchronous theory can be proved， but there also exist many deficiencies. If it should be perfectly reasonable， two judgments must be proved： one is that the clan is human society rather than animal groups； the second is that individuals of primitive horde before the clan are real people instead of being formed people. We can prove the first judgment by comparing the population traits of clan and primitive horde； and the second judgment can be confirmed by several relevant facts. Therefore it can be determined that the original society of human is the clan which is not born with human simultaneously but created by people who had existed before the clan. The emergence of society is a great event in human history.
