Abstract：It is said that in Maxism political textbooks, there are two premises for the extended reproduction of social capital:I(v+m)>IIc and II(c+m-m/x)>I(v+m/x). While the two premises is quite animous, and their static abstract quantity relationship cannot truly uncover the basic connotation and objective demand of whether the productive elements need an addition or not. This paper thinks that, the realization of the social capital from simple reproduction to the extended one should be advanced little by little. And it concludes that the real logically reasonable and dynamic premises are: (B)I(v-m)>(A)IIc; (B)IIC>(A)I(v+m).
