The international financial crisis beginning in the second half of 2008 suspended the global boom cycle in recent years. According to the analysis report of International Monetary Fund，except the petroleum consumption，the declination of global per capita GDP，consumption，investment and import & export，industrial production employment，international capital liquidity and other main economic indicators exceeds the previous economic crises since 1975，which indicates the most serious recession since the World War Ⅱ. For the performance of the main economies，from Lehman Brothers’bankruptcy to the 1st quarter of 2009，America’s recession had lasted for 18 months，and the duration of the recession was longer than the first petroleum crisis in 1970s and the savings and loan crisis in 1980s. The GDP of the Euro zone most dropped since 1995 when the data was started to be recorded. Japan’s economy declined by 14.2% in the revised GDP in the 1st quarter of 2009，and had negative growth for 4 quarters in a row.