China's central bank raised interest rates, interest rates rose, domestic inflation was controlled, and the currency was tightened. Because of the frequent economic and trade exchanges between China and Europe and the United States, and the economic crisis in 2009, the economic recovery of all countries in the world is very dependent on China. Therefore, China's interest rate hike, reduced market liquidity, and reduced funds for production, investment and loans directly affected foreign trade transactions. If foreign economies are not much better, their currencies will naturally depreciate relatively. This proves that the economy is strong and the currency is strong. This is the impact on the foreign exchange market. The last rate hike in China was 20 10 year 10/0/9. At 5-6 pm that day, Africa and the United States fell by nearly 100.