For most floor funds, you can buy on the same day, but you can't sell on the same day. For some T+0 floor funds, investors can sell them on the same day, such as Shenzhen Hang Seng Index ETF (510900); Crude oil fund (16 1 129), and some QDII funds in the market.

When investors buy these floor funds in T+0 trading, they can use the fluctuation of fund net value to make intraday high-selling and low-sucking operations, that is, buy at the low level of fund net value on that day and sell at the high level of fund net value to earn the difference.