关键词: 欧债危机, 低生育率陷阱, 福利社会, 抚养比, 人口结构生产性

Abstract: Abstract: The European Debt Crisis is a systemic imbalance among the European population structure，economic structure，welfare structure and political structure In the low fertility trap ，the high degree of aging and heavy dependency ratio fundamentally shake the population basis of welfare socie-
ty，while the European debt crisis expands the impacts of population structural changes from the economic field to the social and political fields European debt crisis is also a warning for China， where demographic，economic and social structural changes have been rapidly undergoing Under the circumstance of multiple challenges resulting from the combined complexity of an aging population，the increasing dependency ratio，slowing economic growth，the threat to middle － income trap，social transformation and reconstruction of social interests relationship， how to learn lessons from the debt crisis and to establish incentive and adaptive social institutions to coping with future population changes would be vital in making strategic choices of social development in China.

Keywords: European Debt Crisis, Low Fertility Trap, Welfare Society, Dependent atio, Productivity of Population Structure