Abstract: As a kind of social existence and social nature, human beings must live together. Historically, humans have different ways of combining, and the conditions of human development are also different. In the pre-modern society, human development is in the stage of natural dependence relationship, during which there is no individual subject, only the existence of groups, and people live together; it is the universal ethic that maintains the common life. In modern society, market economy liberates people from dependence, establishes the independence of people, makes the individual a kind of single existence, leads an isolated personal life, and makes morality a free choice of individuals; what sustains the life between individuals are contracts and the rule of law. In contemporary society, the individual subjectivity is constantly expanding, which leads to the crisis of individual subjectivity. Reflecting on the individual subjectivity, the individual breaks the self-closure and moves towards inter subjectivity, and people construct public life and seek moral consensus in equal communication. In short, the three stages of the development of human society reflect the tension between the community and the individual, and the contemporary social development is moving from "I" to "we", seeking the unity of individuality and publicity.