It is legal, because the government does not interfere with citizens' personal investment, and the transaction does not take place in China. At present, the role of domestic foreign exchange companies is to save you the step of going abroad. But if your funds are not remitted abroad, it is definitely not a legitimate company. In other words, it is legal, but these companies must be strictly regulated. 2. At present, there are two main channels for China investors to invest in the foreign exchange market. One is to make a firm offer for foreign exchange opened by domestic banks, and the other is to directly open an account abroad for foreign exchange margin business through the domestic agent of overseas dealers. Third, due to the large spread of foreign exchange firm offer (which can be understood as high transaction cost), the general rate of return is difficult to meet except for the large fluctuation of exchange rate. Because of its two-way transaction, foreign exchange margin business can be long or short, and because of its leverage ratio, it can be small or wide. Four, at present, the domestic foreign exchange margin business has not been fully opened. However, at present, the state does not interfere with citizens' overseas investment, so at present, foreign mainstream platforms generally find agents in China to do customer development and service for them. Being a mainstream platform abroad has great advantages.