If investors think that an ETF fund will fall in the future, they can open the function of margin financing and securities lending, and carry out financing or securities lending for two ETF funds with financial management targets, so as to buy up and buy down. Take the computer version of the flush software, click on the fund interface, and the funds with the letter "R" can be used for margin financing and securities lending. Financing means that the foundation has gone up, so I borrow money from securities companies to buy funds; Securities lending refers to borrowing securities from brokers and selling them because they think the fund is falling, and then buying them from a low position after the market falls, and returning the fund to the securities company, thus earning the intermediate price difference.