In existing international monetary system, the American dollar holds the absolute hegemony. After the sub-prime crisis, the Government of United States holds a laissez-faire policy of U.S. An effective international monetary system should help to promote international trade and investment, and achieve equitable distribution of dividends among countries. Existing international monetary system faces prominent defects, such as the supply and demand imbalance of reserve currency, lack of self-driven adjustment mechanism, and extremely unstable flow of capital in the world. To reform the international monetary system has become the trend of the times. In a long period of time, the global economy cannot get rid of dependence on the U.S. market. The status of America, as the supplier of final product market, will not undergo significant changes. The modes for its reform and innovation mainly include the multi-standard monetary mode, the super-sovereign currency mode, and the American dollar mode.