After the second-stage I-O technique, as GDP of its core, is issued, it gets easy to raise the time efficiency. Therefore, some experts payed most attention to it and put forward much useful standpoints.However, parts of them are not enough perfectful. The relationship among the first-stage I-O multiplier, Keynesian multiplier and the struetural Keynesian multiplier are pushing forward and not the same layer concept. As to the design of the seeond-stage I-O stable, that the third quadrant should inerease the vector of labor income and the government eonsumption should reserve at the seeond quadrant, etc are put forward.