The foreign exchange market is a global open market, there are about 30 major foreign exchange markets in different countries and regions on all continents. The foreign exchange market in the opening hours of this and that off, 24 * 5 uninterrupted trading. Among them, the European and American trading activities are the most active, PGM recommends that investors pay attention to the Beijing time 16:00-18:00 (Asian and European cross session), 21:00-24:00 (European and American cross session) and other high liquidity of the trading hours. If you need to hold a position overnight, you need to ensure that the margin is sufficient, to avoid the end of the European and American trading session to the beginning of the Asian trading session due to the lack of liquidity in the market, resulting in a wide spread or slippage phenomenon that leads to the collapse of the position.