According to Popper s Three-World Theory, the direct source of a writer s idea belongs to World-I, the Objective World; the idea itself belongs to World-II, the World of Thought; and the linguistic product out of this idea belongs to World-III, the World of Texts.

On the basis of the definition of three worlds of mathematics,we introduce the different roles that language plays in three worlds of mathematics.

The middlezone thought is the basis of the three worlds theory, While the latter is the development of the former.

Mao Zedong,the founding father of New China,noticed acutely the changes in international situation,and elaborated the theory of "intermediate zones ",and finally developed it into the division of the "three worlds",the inner logic of this development contains the understatement that the world situation will go multi-polarized.

Theory of Division of the Three Worlds and Its Development at Present;

Based on the Triadic Ethics and the dialectical analysis of the Virtue Theory by Kant,overstepping the limits of the Two Worlds Theory by Kant and Alasdair MacIntyre s thoughts of western imagination,it is possible for the people,in the process of reclaiming Public Space of Morality,to construct a "new kind of virtue theory",by which the new Theory of Practice and the Three Worlds can be expected.

Mao Ze-dong s strategy theory of"the three worlds"is based on world situation and the great changes of the basic contradictions in the world,especially on the fact that there is a vast intermediate region between the great two poles of USA and USSR.