Illegal, foreign exchange margin is the top product in the global personal financial products. As the domestic standard system has not been established, three domestic banks, Industrial and Commercial Bank of China, Minsheng Bank and China Construction Bank, started trial operation in June 2007, but all of them were suspended in June 20 12.

Foreign exchange transaction is the exchange of one country's currency with another. Different from other financial markets, the foreign exchange market has no specific location and no central exchange, but transactions between banks, enterprises and individuals through electronic networks. "Foreign exchange trading" means buying one of a pair of currencies at the same time and selling the other. Foreign exchange is traded in the form of currency pairs, such as Euro/USD or USD/JPY.