The shift from 'Supply-side Structural Reform' to 'Effective Synergy between Demand-Side Management and Supply-side Structural Reform' is an important layout for China in the new development stage. On the basis of background and historical experience, this paper uses Marxist political economy theory to analyze the meaning and logic of demand-side management, and points out why this policy can promote the upgrading of the industrial structure, expand the effective supply, rationalize the distribution structure, expand the effective demand, optimize the way of market-oriented allocation of factors, improve the market circulation environment, expand domestic consumption demand, cultivate a complete domestic demand system, and thus smooth four links including production, distribution, circulation and consumption. This paper also explains how demand-side management can build a new development pattern with domestic circulation as the main body and domestic and international dual circulation, and how to promote the further realization of people's beautiful life.