The international monetary system is a convertible currency of the countries, the international balance of payments adjustments, the international reserve assets of common issues such as the composition of the arrangements established by the rules. The measures taken and the corresponding organizations of the sum. Effective and stable international monetary system is an extremely important international economic links. Gold and U.S. dollar against the implementation of the free float. U.S. dollars can no longer be around the centre of national currencies. This indicates that not Brandi forest system has been the basis of all the loss, the system has completely collapsed. However, by not meeting the birth of the forest Brandi two bodies ---- the World Bank and International Monetary Fund is still in world trade and financial structure of playing a key role. The collapse of reasons: 1, the system's own shortcomings Dollar as the center of the collapse of the international monetary system and the fundamental reason for this is that the system itself can not escape the existence of contradictions. Under such a system, the U.S. dollar as an international means of payment and means of international reserves, playing a world currency functions. 2, the dollar crisis and the frequent outbreak of the U.S. economic crisis Cixiaobichang the capitalist world economy, the dollar crisis is not caused forest Brandi the direct cause of the collapse. ① U.S. gold reserves to reduce ② the United States fueling inflation ③ the U.S. balance of payments deficit continued That is, foreign exchange liberalization, liberalization of capital and trade liberalization as the main content of the multilateral economic system is formulated by the United States to achieve its economic hegemony of the system.