To promote the structural reform of the supply side is an innovative measure to adapt to the new stage of economic development.On the one hand, it is the initiative choice to across the "middle-income trap" and to change the mode of economic development; on the other hand, it is a comprehensive deepening of reform and the inevitable requirement of building a well-off society in an all-round way. The"13th Five-Year" period is a critical period of economic structure adjustment. At the present, the main contradiction China is facing from the demand side to the supply side, and also facing institutional, structural contradictions. We must reduce the invalid supply, increase the effective supply, and enhance the driving force of economic development, to make a sustained and healthy economic development.