Initial stage ends in World War II, the United States is the state that has credit most, the exchange rate of the dollar also is the stablest, be equivalent to a kind avoiding danger money, other country is willing to do business and be changed with the dollar. Begin from 2017, the United States restricts the development of each oil nation ceaselessly, begin a series of policy will be aimed at big country of a few oil, the 11 countries such as China, Russia and Venezuela are carried case go the old standard that the dollar changes, be used less as far as possible in commerce or need not the dollar will do business, and convert other currencies. In the process that drops slowly in the position of the dollar, the RMB has made the foreign exchange reserve with each country necessary central bank. Go the dollar is changed is tide of a history, it is the necessity tendency that the history develops.