The US financial crisis brings a great impact on the globe fi nance， economy and trade. The policies and measures on dealing with the financial crisis and stimulating the economic recovery have been made by countries in the world， so does in the U.S. .US President Barack Obama signed 《The American Reinvestment and Recovery Act 2009》(the Act)into law on Feb. 17， 2009. However， the hot debates on the U.S. stimulus Act have been arisen not only in the U.S.， but at the global level before and after the Act comes into being. The Buy American Provisions in the Act has come into focus. It is very obvious that the Buy American Provisions feature the trade protectionism. The countries in the world have to fight against the trade protectionism while dealing with the financial and economic crises at the same time.