Abstract:On the decision-making time, the relation construction of the things is a space-structure rather than flat-structure, and the evolvement process is not an addition of time section but a continued link upon the inherence relation. As a result, in addition to the expression on the space-structure of the correlation things, the decision-making situation should express its emerged tendency from the relation function, because only this can depict its structure at the moment and the future emerged trend, and express its instant evolvement and developing. This paper gives the concept of decision-making situation,then expresses its time-space structure.