This paper uses VAR model and select total assets of Federal Reserve, CPI, total manufacturing/industrial production, REER (real broad effective exchange rate adjusted by relative consumer prices), net exports and 3-month interbank rate as indicators to measure the impact of the US monetary policy on China, Japan, EU Area and Canada. There are several key findings. Firstly, US monetary policy shock has spillover effects on the national production, consuming price and central bank action. Secondly, the change of the value of US dollar does not have significant effect on exchange rate for China, EU Area and Japan due to the adoption of flexible exchange rate, while there is significant change in Canada. Thirdly, the monetary policy shock from US is not transmitted to national trade. Finally, the decline of real effective exchange rate in the short-run shows the increasing external competitiveness.