This paper is a comparative study on the differences between the structures of "yibianA, yibianB " and "youA, youB " in the syntactic, semantic, pragmatic viewpoint.I tried to explain the semantic feature of these structures and the relationship of A and B through a semantic approach. In the pragmatic view, this paper explains the focus of expression, the order of A and B. Finally, I analysed the types of the syntactic elements these two structures can serve as,and the situation in which they can emerge.