The international monetary system is an arrangement rule for common problems such as currency convertibility, balance of payments adjustment and the composition of international reserve assets. Measures taken and corresponding organizations. An effective and stable international monetary system is an extremely important international economic link. Gold floats freely against the dollar. The dollar is no longer the center of national currencies. This shows that the foundation of the non-Brandi forest system has been completely lost, and this system has completely collapsed. However, two institutions, the World Bank and the International Monetary Fund, which were born out of unsatisfied Forest Brandi, still play a key role in the world trade and financial structure. The reason for the collapse: 1, the defects of the system itself. The fundamental reason for the collapse of the international monetary system centered on the US dollar lies in the unavoidable contradictions in the system itself. Under such a system, the US dollar, as a means of international payment and international reserve, plays the role of the world currency. 2. The dollar crisis and the frequent American economic crisis have little impact on the capitalist world economy, and the dollar crisis is not the direct cause of the collapse of Brady Forest. (1) The US gold reserves decrease; (2) The US encourages inflation; (3) The persistent deficit in the US balance of payments, that is, the multilateral economic system with foreign exchange liberalization, capital liberalization and trade liberalization as its main contents, is a system formulated by the United States to realize its economic hegemony.