In recent years,the contribution of resident consumption to the increase of GDP have decreased largely and constantly.since 2008,to Challenge the global economic crisis and promote the stable and fast develpment of economy,central and start an initiative amounting 40 trillion Yuan to realize the strategic goals of "stimulating the domestic demands,maintaining the economic growth and adjusting the structure".starting from this background,the author analyzes the reasons of the shrinking of domestic demands from macro-perspective and puts forward some suggestions by applying relative economic theories.