Abstract: Human is a kind of rational animals. Their ideals have come from their dissatisfaction of the real world, at the same time, are the critics, resistance or even rebellion against our society. They are derived from people's hopes, and are the yearning and calling for the better life in the future as well as the thirst for the perfection of both themselves and the society. However, such ideals are neither fantasy nor illusion, but the imagination based on their rationality which is fused with a lot of human values. Through the pursuit for their ideals, the significance and value of human life can be realized and shown, so can the human nobility and dignity. Nevertheless, such ideals have come from the reality, and are the unity between exploration and pursuit for standardization, as well as the unity between history and logic. Only on this basis can the ideals consolidate their own foundation and become the necessary choice of history.