"Liyun Datong" was the earliest system expression of idealisms in pre-Qin schools in the original period of Chinese culture and later formed lasting vitality in the historical change and social development. In modern times, it absorbed the achievements of human civilization, complied with the trend of human development, criticized the tradition, judged the West, looked to the future, successfully realized the docking with socialism, and became national cultural resources of socialism with Chinese characteristics. "Chinese dream" both adheres to historical choice and national characteristics of Chinese socialism and establishes the ambitious goals and path selection for its practice. Chinese traditional idealism has exuberant vitality, which is not only a kind of the goal and pursue of social development, is also one kind of critique spirit of surmounting to reality."Chinese dream" is a paradigm of thinking, value orientation and the spirit for searching, which sets up an idealism dimension for the revival of Chinese nation and the healthy development of society.