Global financial crisis，world multipolarization and Obama’s success in US presidential election were proved to be new opportunities for LAC countries to adjust their foreign policies. During his early days in the White House，Obama adopted series of policies to better US relations with LAC. However，the Military Cooperation Agreement with Colombia and the US position on Honduras coup subjected the relationship between the US and LAC countries to a new test. During 2009，LAC countries’ continuing integration efforts were undermined by internal political wrangles，disputes over boarder issues and increasingly rampant trade conflicts. The US factor drove the existing conflicts and contradictions even acuter. Meanwhile，progresses were made in diversifying LAC’s foreign relations，LAC’s traditional relationship with the EU continued to be consolidated and new advances were seen in their relationship with China and other Asia-Pacific countries，Russian and Iran as well.