中文摘要：

2008年国际金融危机爆发以来,美国主权债务规模快速攀升,风险不断增加。文章系统地阐述了美国主权债务的特点、成因及未来风险发展趋势。美国主权债务的特点表现为本币标价、债务规模巨大、利息支出负担日益沉重、国际资金循环的重要环节;成因主要包括美元是国际货币、凯恩斯学派的指导思想和巨额的财政赤字;未来风险的发展主要取决于美国经济增长、财政赤字、利率变化、老龄化对隐性债务的影响、金融危机等造成的意外冲击、国会两党斗争是否会造成债务违约等。

英文摘要：

Since the international financial crisis in 2008,the United States＇ sovereign debt rising fast,so the risk is increasing. This paper systematically describes the characteristics of the sovereign debt of the United States,causes and future risk trends. The features of American sovereign debt are： denominated in dollar,huge debt,increasingly heavy interest burden,an important part of international capital circulation; the causes include that dollar is the international currency,the guiding ideology of the Keynesian,and the massive deficit; the future risks development depends on US economic growth,budget deficit,interest rate changes,the impact of aging on the implicit debt,the unexpected shock caused by the financial crisis,the debt caused by the struggle between the two parties and so on.