According to the principle of Marxist political economy on the relationship between production and consumption, consumption and investment promote each other and cannot be separated. The dialectical unity of consumption and production determines the circular relationship between consumption and investment. On the one hand, investment promotes consumption; on the other hand, consumption promotes investment. This circular relationship between consumption and investment forms a virtuous cycle in which consumption and investment promote each other. Deepening the supply side structural reform, focusing on expanding the synergy between effective consumption and demand, breaking through the bottlenecks in the domestic circulation, and leveraging the advantages of a super large market and strong production capacity are effective ways to form a virtuous cycle of mutual promotion between consumption and investment.