Abstract:The common humanity and the grade humanity are the ancient topics on humanity, which have resulted in a confused, complicated and endless disagreement. Historically, the common humanity was attacked and criticized by doctrine of three classes of human nature and the theory of human nature of class. And presently, they are subjected to deconstruction which are plausibly justified and righteous, but actually are full of paradoxes and contradictions, errors and omissions. It is imperative to re-verify, compare, specify and reflect the gains and losses of expositions on Sino-foreign history of thoughts, which is of theoretical and practical significance for rectification and is of enlightening importance to grasp common humanity, to formulate policies based on humanity and finally to realize peace and prosperity for people and the country respectively.