QDII fund refers to a securities investment fund established in a country and approved by the relevant departments of the country to engage in securities business such as stocks and bonds in overseas securities markets.

QFII fund is the abbreviation of English qualified foreign institutional investors. Under the QFII system, qualified foreign institutional investors (QFII) will be allowed to remit a certain amount of foreign exchange funds and convert them into local currency, and invest in the local securities market through special accounts under strict supervision and management. All kinds of capital gains, including dividends, bid-ask spreads, etc., can be converted into foreign exchange for remittance after examination, which is actually a limited opening of the domestic securities market to foreign investors.