According to Article 8 of the Agreement of the International Monetary Fund, the general obligation of member countries is that a country's currency must meet three conditions to become a free foreign exchange:

1. There are no restrictions on the current account (trade and non-trade payments) and capital transfer in China's balance of payments.

2. Don't take discriminatory monetary measures or multi-currency exchange rates.

3. At the request of another member state, it is obliged to buy back the remaining domestic currency in the current account of the other party at any time.

A freely convertible currency is widely used in international exchange settlement, freely traded in the international financial market, and freely convertible into the currencies of other countries. In international trade, the import and export trade settled in these freely convertible currencies is called spot trade.