Foreign exchange banks are also called "exchange banks". Banks specializing in foreign exchange business and international settlement. Its main business is: dealing in foreign exchange trading and exchange, handling foreign trade settlement, providing foreign exchange credit and guarantee for domestic importers and exporters, and issuing securities abroad. This bank usually has many branches abroad. There are franchisees and part-time operators; There are domestic banks and branches of foreign banks. In countries that implement foreign exchange control, in order to achieve effective control purposes, most authorized designated foreign exchange banks are required to handle foreign exchange business. In the mode of operation, there are mainly international general branch system and international bank agency system. China Bank is a professional foreign exchange bank designated by the state.