The appreciation rate of foreign exchange is also called exchange rate, or export exchange rate. Refers to the amount of foreign exchange actually collected by banks, minus the amount of foreign exchange used for import and export, which accounts for the percentage of exports (financial caliber). It directly reflects the foreign exchange earning effect of raw materials (including auxiliary materials) purchased by foreign exchange, processed into finished products (including semi-finished products) and exported, that is, the foreign exchange earning effect of "feeding in and discharging out".