etf can arbitrage. Investors can use its trend of high selling and low attracting to arbitrage, or they can use the price difference between on-site and off-site to arbitrage, that is, when the on-site market price is lower than the net value of off-site funds, investors can buy the fund in the stock account on T day, and then redeem the fund in the column of "On-site funds", and the funds will be received on T+2 day; When the market price on the spot is higher than the net value of the OTC fund, the investment can purchase the fund in the column of "OTC fund" in the stock account on T day, the fund share will be confirmed on T+1 day, and the arbitrage will be completed on T+2 day.