Definition of RMB exchange rate: "exchange rate" is also called "exchange rate", that is, the ratio of one country's currency to another country's currency is the price of another currency expressed in one currency. Because of the different names and values of currencies in the world, one country's currency should set an exchange rate for other countries' currencies, that is, the exchange rate.

The exchange rate of RMB is the ratio of RMB to another country's currency.

The RMB exchange rate generally refers to the quotation of RMB against USD, that is, how much USD RMB 1 or RMB 100 is converted into. With the appreciation of the RMB, the RMB exchange rate has also risen accordingly.

The dollar index is mainly calculated by the weighted exchange rate of the dollar against six currencies, such as the euro, the Japanese yen and the British pound, and has no corresponding relationship with the RMB exchange rate. The rise of the US dollar index means the rise of the exchange rate of the US dollar against non-US currencies. Although the US dollar index is not directly related to the RMB exchange rate, the rise of the US dollar index will still affect the exchange rate between the US dollar and RMB.

On the other hand, China holds the most dollars. Therefore, the United States unilaterally let the renminbi appreciate, with the lowest cost and the largest profit. Because the dollar index looks "firm" at least temporarily after the devaluation of RMB, but as China, if the dollar index has not changed, the appreciation of RMB is actually the appreciation of all the major currencies in the world. This is equivalent to making China "responsible" for the global financial crisis. No matter how rich and stupid China is, there is nothing he can do. Therefore, if China can't resist the pressure from the United States, it will try its best to make other currencies depreciate sharply, and the final result will be to lower the dollar index.