Purchase of foreign exchange refers to the purchase of foreign exchange in China, and it is necessary to exchange RMB for foreign currency. For example, if a China enterprise needs to pay foreign suppliers, it needs to buy foreign exchange and convert RMB into foreign currency.
Selling foreign exchange refers to selling foreign exchange in China and converting foreign currency into RMB. For example, when a foreign enterprise exports goods to China and receives RMB income, it needs to exchange RMB for local currency, so it needs to sell foreign exchange.
Therefore, the direction of foreign exchange trading is different. Foreign exchange purchase is to convert RMB into foreign currency, and foreign exchange sale is to convert foreign currency into RMB.