Regardless of the influence of news, the short-term fluctuations in the day will not be almost synchronized, and the fluctuations in foreign exchange will be much greater. Of course, the period of large fluctuations in foreign exchange is generally at night, because the main market is still in the United States, and some indicators such as the American non-agricultural index are the main factors affecting the foreign exchange market. Of course, the influence of national monetary policies is also great. The essence of foreign exchange is the exchange of currency value, that is, the object is currency. The Shanghai Composite Index represents listed companies, so there is no direct connection between them. This year, the exchange rate of RMB against the US dollar fluctuated greatly, rising first and then falling, and it has been relatively stable recently.