Since mid-January, the exchange rate of RMB against the US dollar has depreciated again, with the maximum depreciation reaching 4.2% as of the close of February 27th. The main reason for the reversal of the appreciation momentum of RMB exchange rate before is that the economic growth between China and the United States is expected to be poor, that is, the risk of economic recession in the United States has not been fulfilled in the short term, while the strong recovery of China's economy has yet to be verified. In addition, inflation in the United States is stubborn, and the expectation that the Federal Reserve will slow down or stop raising interest rates has been significantly reversed.Driven by the scissors difference between the downward interest rate caused by the release of liquidity